docs(template-syntax): review and update Dart to new doc design (#1465)

* ts template-syntax.jade without docregion tags
* update guide/template-syntax for dart and ts
* clarify style property naming in Dart

public/_includes/_util-fns.jade

@@ -21,6 +21,7 @@
 - var _an = 'an';
 
 //- TS arrays vs. Dart lists
+- var _Array = 'Array';
 - var _array = 'array';
 //- Deprecate now that we have the articles _a and _an
 - var _an_array = 'an array';
@@ -32,6 +33,9 @@
 //- Location of sample code
 - var _liveLink = 'live link';
 
+//- Other
+- var _truthy = 'truthy';
+- var _falsey = 'falsey';
 
 //- Used to prefix identifiers that are private. In Dart this will be '_'.
 - var _priv = '';
@@ -39,8 +43,8 @@
 //- Use to conditionally include the block that follows +ifDocsFor(...).
 //- Generally favor use of Jade named blocks instead. ifDocsFor is convenient
 //- for prose that should appear only in one language version.
-mixin ifDocsFor(lang)
+mixin ifDocsFor(langPattern)
-  if _docsFor.toLowerCase() === lang.toLowerCase()
+  if _docsFor.toLowerCase().match(langPattern.toLowerCase())
     block
 
 //- Use to map inlined (prose) TS paths into, say, Dart paths via the

public/docs/_examples/template-syntax/dart/lib/app_component.dart

@@ -3,6 +3,7 @@ import 'dart:convert';
 import 'dart:html';
 
 import 'package:angular2/core.dart';
+import 'package:angular2/common.dart';
 
 import 'hero.dart';
 import 'hero_detail_component.dart';
@@ -40,7 +41,9 @@ class AppComponent implements OnInit, AfterViewInit {
   bool isSpecial = true;
   bool isUnchanged = true;
   bool isSelected = false;
+  final Color colorRed = Color.red;
   Color color = Color.red;
+  var colorEnum = Color;
 
   List<Hero> heroes;
   Hero currentHero;
@@ -56,7 +59,7 @@ class AppComponent implements OnInit, AfterViewInit {
   final Hero nullHero = null;
   Map product = {'name': 'frimfram', 'price': 42};
   FormElement form;
-  String clickity = '';
+  String clicked = '';
   String clickMessage = '';
   String clickMessage2 = '';
   final String iconUrl = 'assets/images/ng-logo.png';
@@ -87,14 +90,14 @@ class AppComponent implements OnInit, AfterViewInit {
 
   int getVal() => val;
 
-  void onCancel(MouseEvent event) {
+  void onCancel(UIEvent event) {
-    DivElement el = event.target;
+    HtmlElement el = event?.target;
     var evtMsg = event != null ? 'Event target is ${el.innerHtml}.' : '';
     alerter('Canceled. $evtMsg');
   }
 
-  void onClickMe(MouseEvent event) {
+  void onClickMe(UIEvent event) {
-    DivElement el = event.target;
+    HtmlElement el = event?.target;
     var evtMsg = event != null ? 'Event target class is ${el.className}.' : '';
     alerter('Click me. $evtMsg');
   }
@@ -103,9 +106,10 @@ class AppComponent implements OnInit, AfterViewInit {
     alerter('Deleted hero: ${hero?.firstName}');
   }
 
-  bool onSave([MouseEvent event = null]) {
+  bool onSave([UIEvent event = null]) {
+    HtmlElement el = event?.target;
     var evtMsg =
-        event != null ? ' Event target is ${event.target.innerHtml}.' : '';
+        event != null ? ' Event target is ${el.innerHtml}.' : '';
     alerter('Saved. $evtMsg');
     return false;
   }

public/docs/_examples/template-syntax/dart/lib/app_component.html

@@ -31,11 +31,11 @@
 </div>
 <br>
 <a href="#star-prefix">* prefix and &lt;template&gt;</a><br>
-<a href="#local-vars">Template local variables</a><br>
+<a href="#ref-vars">Template reference variables</a><br>
 <a href="#inputs-and-outputs">Inputs and outputs</a><br>
 <a href="#pipes">Pipes</a><br>
 <a href="#safe-navigation-operator">Safe navigation operator <i>?.</i></a><br>
-<!--<a href="#enums">Enums</a><br>-->
+<a href="#enums">Enums</a><br>
 
 <!-- Interpolation and expressions -->
 <hr><h2 id="interpolation">Interpolation</h2>
@@ -105,9 +105,9 @@
 <!-- #docregion event-binding-syntax-1 -->
 <button (click) = "onSave()">Save</button>
 <hero-detail (deleteRequest)="deleteHero()"></hero-detail>
-<div (myClick)="clickity=$event">click me</div>
+<div (myClick)="clicked=$event">click me</div>
 <!-- #enddocregion event-binding-syntax-1 -->
-{{clickity}}
+{{clicked}}
 <br><br>
 
 <div>
@@ -184,15 +184,14 @@ button</button>
 <!-- #enddocregion property-binding-5 -->
 
 <!-- #docregion property-binding-6 -->
-  <!-- BAD! HeroDetailComponent.hero expects a Hero object,
+<!-- ERROR: HeroDetailComponent.hero expects a
-  not the string "currentHero".
+     Hero object, not the string "currentHero" -->
-
-  <hero-detail hero="currentHero"></hero-detail> -->
 <!-- #enddocregion property-binding-6 -->
-
+<div *ngIf="false">
-<!--  In checked mode, uncommenting the hero-detail above causes this:
+<!-- #docregion property-binding-6 -->
-    EXCEPTION: type 'String' is not a subtype of type 'Hero' of 'value'. -->
+  <hero-detail hero="currentHero"></hero-detail>
-
+<!-- #enddocregion property-binding-6 -->
+</div>
 <!-- #docregion property-binding-7 -->
 <hero-detail prefix="You are my" [hero]="currentHero"></hero-detail>
 <!-- #enddocregion property-binding-7 -->
@@ -202,7 +201,7 @@ Interpolated: <img src="{{heroImageUrl}}"><br>
 Property bound: <img [src]="heroImageUrl">
 
 <div>The interpolated title is {{title}}</div>
-<div [textContent]="'The [textContent] title is '+title"></div>
+<div [innerHTML]="'The [innerHTML] title is '+title"></div>
 <!-- #enddocregion property-binding-vs-interpolation -->
 
 <a class="to-toc" href="#toc">top</a>
@@ -258,9 +257,7 @@ Property bound: <img [src]="heroImageUrl">
 <!-- #docregion class-binding-2 -->
 <!-- reset/override all class names with a binding  -->
 <div class="bad curly special"
-     [class]="badCurly">Bad curly</div>
+     [className]="badCurly">Bad curly</div>
-<p><b>Note:</b> "Bad curly" should be smaller but isn't, due to
-  <a href="http://github.com/angular/angular/issues/6901">issue #6901</a>.</p>
 <!-- #enddocregion class-binding-2 -->
 
 <!-- #docregion class-binding-3 -->
@@ -374,15 +371,15 @@ bindon-ngModel
 <br>
 <!-- #docregion NgModel-3 -->
 <input
-    [ngModel]="currentHero.firstName"
+  [ngModel]="currentHero.firstName"
-    (ngModelChange)="currentHero.firstName=$event">
+  (ngModelChange)="currentHero.firstName=$event">
 <!-- #enddocregion NgModel-3 -->
 (ngModelChange) = "...firstName=$event"
 <br>
 <!-- #docregion NgModel-4 -->
 <input
-    [ngModel]="currentHero.firstName"
+  [ngModel]="currentHero.firstName"
-    (ngModelChange)="setUpperCaseFirstName($event)">
+  (ngModelChange)="setUpperCaseFirstName($event)">
 <!-- #enddocregion NgModel-4 -->
 (ngModelChange) = "setUpperCaseFirstName($event)"
 <br>
@@ -443,7 +440,7 @@ bindon-ngModel
 <!-- #enddocregion NgIf-1 -->
 
 <!-- #docregion NgIf-2 -->
-<!-- not displayed because nullHero is false.
+<!-- because of the ngIf guard
     `nullHero.firstName` never has a chance to fail -->
 <div *ngIf="nullHero != null">Hello, {{nullHero.firstName}}</div>
 
@@ -487,33 +484,33 @@ bindon-ngModel
 </fieldset>
 
 <div class="toe">
-    <div *ngIf="toeChoice == null">Pick a toe</div>
+  <div *ngIf="toeChoice == null">Pick a toe</div>
-    <div *ngIf="toeChoice != null">
+  <div *ngIf="toeChoice != null">
-      You picked ...
+    You picked ...
-      <!-- #docregion NgSwitch, NgSwitch-expanded -->
+    <!-- #docregion NgSwitch, NgSwitch-expanded -->
-      <span [ngSwitch]="toeChoice">
+    <span [ngSwitch]="toeChoice">
       <!-- #enddocregion NgSwitch -->
 
-        <!-- with *NgSwitch -->
+      <!-- with *NgSwitch -->
-        <!-- #docregion NgSwitch -->
+      <!-- #docregion NgSwitch -->
-        <span *ngSwitchWhen="'Eenie'">Eenie</span>
+      <span *ngSwitchWhen="'Eenie'">Eenie</span>
-        <span *ngSwitchWhen="'Meanie'">Meanie</span>
+      <span *ngSwitchWhen="'Meanie'">Meanie</span>
-        <span *ngSwitchWhen="'Miney'">Miney</span>
+      <span *ngSwitchWhen="'Miney'">Miney</span>
-        <span *ngSwitchWhen="'Moe'">Moe</span>
+      <span *ngSwitchWhen="'Moe'">Moe</span>
-        <span *ngSwitchDefault>other</span>
+      <span *ngSwitchDefault>other</span>
-        <!-- #enddocregion NgSwitch -->
+      <!-- #enddocregion NgSwitch -->
 
-        <!-- with <template> -->
+      <!-- with <template> -->
-        <template ngSwitchWhen="Eenie"><span>Eenie</span></template>
+      <template [ngSwitchWhen]="'Eenie'"><span>Eenie</span></template>
-        <template ngSwitchWhen="Meanie"><span>Meanie</span></template>
+      <template [ngSwitchWhen]="'Meanie'"><span>Meanie</span></template>
-        <template ngSwitchWhen="Miney"><span>Miney</span></template>
+      <template [ngSwitchWhen]="'Miney'"><span>Miney</span></template>
-        <template ngSwitchWhen="Moe"><span>Moe</span></template>
+      <template [ngSwitchWhen]="'Moe'"><span>Moe</span></template>
-        <template ngSwitchDefault><span>other</span></template>
+      <template ngSwitchDefault><span>other</span></template>
 
       <!-- #docregion NgSwitch -->
-      </span>
+    </span>
-      <!-- #enddocregion NgSwitch, NgSwitch-expanded -->
+    <!-- #enddocregion NgSwitch, NgSwitch-expanded -->
-    </div>
+  </div>
 </div>
 
 <a class="to-toc" href="#toc">top</a>
@@ -620,7 +617,7 @@ bindon-ngModel
 <p><i>expand to &lt;template&gt;</i></p>
 <!-- #docregion Template-2 -->
 <template [ngIf]="currentHero != null">
-    <hero-detail [hero]="currentHero"></hero-detail>
+  <hero-detail [hero]="currentHero"></hero-detail>
 </template>
 <!-- #enddocregion Template-2 -->
 
@@ -644,15 +641,15 @@ bindon-ngModel
   <!-- ngFor w/ hero-detail Component inside a template element -->
   <!-- #docregion Template-4 -->
   <template ngFor let-hero [ngForOf]="heroes" [ngForTrackBy]="trackByHeroes">
-      <hero-detail [hero]="hero"></hero-detail>
+    <hero-detail [hero]="hero"></hero-detail>
   </template>
   <!-- #enddocregion Template-4 -->
 </div>
 
 <a class="to-toc" href="#toc">top</a>
 
-<!-- template local variable -->
+<!-- template reference variable -->
-<hr><h2 id="local-vars">Template local variables</h2>
+<hr><h2 id="ref-vars">Template reference variables</h2>
 
 <!-- #docregion ref-phone -->
 <!-- phone refers to the input element; pass its `value` to an event handler -->
@@ -672,7 +669,7 @@ bindon-ngModel
   <div class="form-group">
     <label for="name">Name</label>
     <input class="form-control" required ngControl="firstName"
-        [(ngModel)]="currentHero.firstName">
+      [(ngModel)]="currentHero.firstName">
   </div>
 <!-- #docregion ref-form-a -->
   <button type="submit" [disabled]="!theForm.form.valid">Submit</button>
@@ -682,7 +679,7 @@ bindon-ngModel
 <br><br>
 
 <!-- btn refers to the button element; show its disabled state -->
-<button #btn disabled [textContent]="'disabled by attribute: ' + btn.disabled.toString()"></button>
+<button #btn disabled [innerHTML]="'disabled by attribute: ' + btn.disabled.toString()"></button>
 
 <a class="to-toc" href="#toc">top</a>
 
@@ -708,13 +705,15 @@ bindon-ngModel
 <hr><h2 id="pipes">Pipes</h2>
 
 <!-- #docregion pipes-1 -->
-<!-- Force title to uppercase -->
+<div>Title through uppercase pipe: {{title | uppercase}}</div>
-<div>{{ title | uppercase }}</div>
 <!-- #enddocregion pipes-1 -->
 
 <!-- #docregion pipes-2 -->
-<!-- Pipe chaining: force title to uppercase, then to lowercase -->
+<!-- Pipe chaining: convert title to uppercase, then to lowercase -->
-<div>{{ title | uppercase | lowercase }}</div>
+<div>
+  Title through a pipe chain:
+  {{title | uppercase | lowercase}}
+</div>
 <!-- #enddocregion pipes-2 -->
 
 <!-- #docregion pipes-3 -->
@@ -723,16 +722,14 @@ bindon-ngModel
 <!-- #enddocregion pipes-3 -->
 
 <!-- #docregion pipes-json -->
-<!-- We don't suggest using json for debugging; you'd probably use toString() instead.
+<div>{{currentHero}}</div>
-     Is there a good use for the json pipe in Dart? -->
-<!--<div>{{currentHero | json}}</div>-->
 <!-- #enddocregion pipes-json -->
 
 <div>Birthdate: {{(currentHero?.birthdate | date:'longDate') | uppercase}}</div>
 
 <div>
   <!-- pipe price to USD and display the $ symbol -->
-  <label>Price: </label>{{product['price'] | currency:'$'}}
+  <label>Price: </label>{{product['price'] | currency:'USD':false}}
 </div>
 
 <a class="to-toc" href="#toc">top</a>
@@ -742,7 +739,7 @@ bindon-ngModel
 
 <div>
   <!-- #docregion safe-1 -->
-  The title is {{ title }}
+  The title is {{title}}
   <!-- #enddocregion safe-1 -->
 </div>
 
@@ -759,11 +756,10 @@ bindon-ngModel
 </div>
 
 
-
 <!--
 The null hero's name is {{nullHero.firstName}}
 
-  See console log:
+See console log:
   EXCEPTION: The null object does not have a getter 'firstName'.
 -->
 
@@ -784,19 +780,16 @@ The null hero's name is {{nullHero.firstName}}
 
 <a class="to-toc" href="#toc">top</a>
 
-<!-- Todo: discuss this in the Style binding section -->
+<!-- TODO: discuss this in the Style binding section -->
 <!-- enums in bindings -->
-
 <hr><h2 id="enums">Enums in binding</h2>
 
-<!--<p>The name of the Color.red enum is {{color}}</p>-->
+<p>
-<p>The current color number is {{color}}</p>
+  <!-- #docregion enums -->
-<p><button [style.color]="color.toString()" (click)="colorToggle()">Enum Toggle</button>
+  The name of the Color.red enum is {{colorRed}}.<br>
-
+  The current color is {{color}} and its index is {{color.index}}.<br>
-<a class="to-toc" href="#toc">top</a>
+  <button [style.color]="color.toString()" (click)="colorToggle()">Enum Toggle</button>
-
+  <!-- #enddocregion enums -->
-<!-- #docregion my-first-app -->
+</p>
-<h3>My First Angular Application</h3>
-<!-- #enddocregion my-first-app -->
 
 <a class="to-toc" href="#toc">top</a>

public/docs/_examples/template-syntax/ts/app/app.component.html

@@ -52,13 +52,13 @@
 <!-- #enddocregion title+image -->
 
 <!-- #docregion sum-1 -->
-  <!-- "The sum of 1 + 1 is 2" -->
+<!-- "The sum of 1 + 1 is 2" -->
-  <p>The sum of 1 + 1 is {{1 + 1}}</p>
+<p>The sum of 1 + 1 is {{1 + 1}}</p>
 <!-- #enddocregion sum-1 -->
 
 <!-- #docregion sum-2 -->
-  <!-- "The sum of 1 + 1 is not 4" -->
+<!-- "The sum of 1 + 1 is not 4" -->
-  <p>The sum of 1 + 1 is not {{1 + 1 + getVal()}}</p>
+<p>The sum of 1 + 1 is not {{1 + 1 + getVal()}}</p>
 <!-- #enddocregion sum-2 -->
 
 <a class="to-toc" href="#toc">top</a>
@@ -66,8 +66,8 @@
 <!-- New Mental Model -->
 <hr><h2 id="mental-model">New Mental Model</h2>
 
- <!--<img src="http://www.wpclipart.com/cartoon/people/hero/hero_silhoutte_T.png">-->
+<!--<img src="http://www.wpclipart.com/cartoon/people/hero/hero_silhoutte_T.png">-->
- <!-- Public Domain terms of use: http://www.wpclipart.com/terms.html -->
+<!-- Public Domain terms of use: http://www.wpclipart.com/terms.html -->
 <!-- #docregion img+button -->
 <div class="special">Mental Model</div>
 <img src="images/hero.png">
@@ -184,13 +184,14 @@ button</button>
 <!-- #enddocregion property-binding-5 -->
 
 <!-- #docregion property-binding-6 -->
-<!--
+<!-- ERROR: HeroDetailComponent.hero expects a
-  BAD!
+     Hero object, not the string "currentHero" -->
-  HeroDetailComponent.hero expects a Hero object,
-  not the string "currentHero"
- -->
-<hero-detail hero="currentHero"></hero-detail>
 <!-- #enddocregion property-binding-6 -->
+<div *ngIf="false">
+<!-- #docregion property-binding-6 -->
+  <hero-detail hero="currentHero"></hero-detail>
+<!-- #enddocregion property-binding-6 -->
+</div>
 <!-- #docregion property-binding-7 -->
 <hero-detail prefix="You are my" [hero]="currentHero"></hero-detail>
 <!-- #enddocregion property-binding-7 -->
@@ -199,8 +200,8 @@ button</button>
 Interpolated: <img src="{{heroImageUrl}}"><br>
 Property bound: <img [src]="heroImageUrl">
 
-  <div>The interpolated title is {{title}}</div>
+<div>The interpolated title is {{title}}</div>
-  <div [innerHTML]="'The [innerHTML] title is '+title"></div>
+<div [innerHTML]="'The [innerHTML] title is '+title"></div>
 <!-- #enddocregion property-binding-vs-interpolation -->
 
 <a class="to-toc" href="#toc">top</a>
@@ -278,13 +279,13 @@ Property bound: <img [src]="heroImageUrl">
 <hr><h2 id="style-binding">Style Binding</h2>
 
 <!-- #docregion style-binding-1 -->
-<button [style.color] = "isSpecial ? 'red' : 'green'">Red</button>
+<button [style.color] = "isSpecial ? 'red': 'green'">Red</button>
-<button [style.backgroundColor]="canSave ?'cyan' : 'grey'" >Save</button>
+<button [style.background-color]="canSave ? 'cyan': 'grey'" >Save</button>
 <!-- #enddocregion style-binding-1 -->
 
 <!-- #docregion style-binding-2 -->
-<button [style.fontSize.em]="isSpecial ? 3 : 1" >Big</button>
+<button [style.font-size.em]="isSpecial ? 3 : 1" >Big</button>
-<button [style.fontSize.%]="!isSpecial ? 150 : 50" >Small</button>
+<button [style.font-size.%]="!isSpecial ? 150 : 50" >Small</button>
 <!-- #enddocregion style-binding-2 -->
 
 <a class="to-toc" href="#toc">top</a>
@@ -393,7 +394,7 @@ bindon-ngModel
 <div [ngClass]="setClasses()">This div is saveable and special</div>
 <!-- #enddocregion NgClass-1 -->
 <div [ngClass]="setClasses()" #classDiv>
-After setClasses(), the classes are "{{classDiv.className}}"
+  After setClasses(), the classes are "{{classDiv.className}}"
 </div>
 
 <!-- not used in chapter -->
@@ -409,8 +410,8 @@ After setClasses(), the classes are "{{classDiv.className}}"
 <hr><h2 id="ngStyle">NgStyle Binding</h2>
 
 <!-- #docregion NgStyle-1 -->
-<div [style.fontSize]="isSpecial ? 'x-large' : 'smaller'" >
+<div [style.font-size]="isSpecial ? 'x-large' : 'smaller'" >
-  This div is x-large
+  This div is x-large.
 </div>
 <!-- #enddocregion NgStyle-1 -->
 
@@ -418,12 +419,12 @@ After setClasses(), the classes are "{{classDiv.className}}"
 <p>setStyles returns {{setStyles() | json}}</p>
 <!-- #docregion NgStyle-2 -->
 <div [ngStyle]="setStyles()">
-  This div is italic, normal weight, and extra large (24px)
+  This div is italic, normal weight, and extra large (24px).
 </div>
 <!-- #enddocregion NgStyle-2 -->
 <p>After setStyles(), the DOM confirms that the styles are
   <span [ngStyle]="setStyles()" #styleDiv>
-    "{{getStyles(styleDiv)}}"
+    {{getStyles(styleDiv)}}
   </span>.
 </p>
 
@@ -439,7 +440,7 @@ After setClasses(), the classes are "{{classDiv.className}}"
 <!-- #enddocregion NgIf-1 -->
 
 <!-- #docregion NgIf-2 -->
-<!-- not displayed because nullHero is falsey.
+<!-- because of the ngIf guard
     `nullHero.firstName` never has a chance to fail -->
 <div *ngIf="nullHero">Hello, {{nullHero.firstName}}</div>
 
@@ -603,22 +604,22 @@ After setClasses(), the classes are "{{classDiv.className}}"
 <hr><h2 id="star-prefix">* prefix and &lt;template&gt;</h2>
 
 <h3>*ngIf expansion</h3>
-  <p><i>*ngIf</i></p>
+<p><i>*ngIf</i></p>
-  <!-- #docregion Template-1 -->
+<!-- #docregion Template-1 -->
-  <hero-detail *ngIf="currentHero" [hero]="currentHero"></hero-detail>
+<hero-detail *ngIf="currentHero" [hero]="currentHero"></hero-detail>
-  <!-- #enddocregion Template-1 -->
+<!-- #enddocregion Template-1 -->
 
-  <p><i>expand to template = "..."</i></p>
+<p><i>expand to template = "..."</i></p>
-  <!-- #docregion Template-2a -->
+<!-- #docregion Template-2a -->
-  <hero-detail template="ngIf:currentHero" [hero]="currentHero"></hero-detail>
+<hero-detail template="ngIf:currentHero" [hero]="currentHero"></hero-detail>
-  <!-- #enddocregion Template-2a -->
+<!-- #enddocregion Template-2a -->
 
-  <p><i>expand to &lt;template&gt;</i></p>
+<p><i>expand to &lt;template&gt;</i></p>
-  <!-- #docregion Template-2 -->
+<!-- #docregion Template-2 -->
-  <template [ngIf]="currentHero">
+<template [ngIf]="currentHero">
-    <hero-detail [hero]="currentHero"></hero-detail>
+  <hero-detail [hero]="currentHero"></hero-detail>
-  </template>
+</template>
-  <!-- #enddocregion Template-2 -->
+<!-- #enddocregion Template-2 -->
 
 <h3>*ngFor expansion</h3>
 <p><i>*ngFor</i></p>
@@ -658,7 +659,7 @@ After setClasses(), the classes are "{{classDiv.className}}"
 <!-- fax refers to the input element; pass its `value` to an event handler -->
 <input ref-fax placeholder="fax number">
 <button (click)="callFax(fax.value)">Fax</button>
-  <!-- #enddocregion ref-phone -->
+<!-- #enddocregion ref-phone -->
 
 <h4>Example Form</h4>
 <!-- #docregion ref-form -->
@@ -704,13 +705,15 @@ After setClasses(), the classes are "{{classDiv.className}}"
 <hr><h2 id="pipes">Pipes</h2>
 
 <!-- #docregion pipes-1 -->
-<!-- Force title to uppercase -->
+<div>Title through uppercase pipe: {{title | uppercase}}</div>
-<div>{{ title | uppercase }}</div>
 <!-- #enddocregion pipes-1 -->
 
 <!-- #docregion pipes-2 -->
-<!-- Pipe chaining: force title to uppercase, then to lowercase -->
+<!-- Pipe chaining: convert title to uppercase, then to lowercase -->
-<div>{{ title | uppercase | lowercase }}</div>
+<div>
+  Title through a pipe chain:
+  {{title | uppercase | lowercase}}
+</div>
 <!-- #enddocregion pipes-2 -->
 
 <!-- #docregion pipes-3 -->
@@ -720,16 +723,8 @@ After setClasses(), the classes are "{{classDiv.className}}"
 
 <!-- #docregion pipes-json -->
 <div>{{currentHero | json}}</div>
-
-<!-- Output:
-  { "firstName": "Hercules", "lastName": "Son of Zeus",
-    "birthdate": "1970-02-25T08:00:00.000Z",
-    "url": "http://www.imdb.com/title/tt0065832/",
-    "rate": 325, "id": 1 }
--->
 <!-- #enddocregion pipes-json -->
 
-
 <div>Birthdate: {{(currentHero?.birthdate | date:'longDate') | uppercase}}</div>
 
 <div>
@@ -743,29 +738,29 @@ After setClasses(), the classes are "{{classDiv.className}}"
 <hr><h2 id="safe-navigation-operator">Safe navigation operator <i>?.</i></h2>
 
 <div>
-<!-- #docregion safe-1 -->
+  <!-- #docregion safe-1 -->
-The title is {{ title }}
+  The title is {{title}}
-<!-- #enddocregion safe-1 -->
+  <!-- #enddocregion safe-1 -->
 </div>
 
 <div>
-<!-- #docregion safe-2 -->
+  <!-- #docregion safe-2 -->
-The current hero's name is {{currentHero?.firstName}}
+  The current hero's name is {{currentHero?.firstName}}
-<!-- #enddocregion safe-2 -->
+  <!-- #enddocregion safe-2 -->
 </div>
 
 <div>
-<!-- #docregion safe-3 -->
+  <!-- #docregion safe-3 -->
-The current hero's name is {{currentHero.firstName}}
+  The current hero's name is {{currentHero.firstName}}
-<!-- #enddocregion safe-3 -->
+  <!-- #enddocregion safe-3 -->
 </div>
 
 
 <!--
 The null hero's name is {{nullHero.firstName}}
 
-See console log
+See console log:
-          TypeError: Cannot read property 'firstName' of null in [null]
+  TypeError: Cannot read property 'firstName' of null in [null]
 -->
 
 <!-- #docregion safe-4 -->
@@ -780,27 +775,25 @@ The null hero's name is {{nullHero && nullHero.firstName}}
 </div>
 
 <div>
-<!-- #docregion safe-6 -->
+  <!-- #docregion safe-6 -->
-<!-- No hero, no problem! -->
+  <!-- No hero, no problem! -->
-The null hero's name is {{nullHero?.firstName}}
+  The null hero's name is {{nullHero?.firstName}}
-<!-- #enddocregion safe-6 -->
+  <!-- #enddocregion safe-6 -->
 </div>
 
 
 <a class="to-toc" href="#toc">top</a>
 
-<!-- Todo: discuss this in the Style binding section -->
+<!-- TODO: discuss this in the Style binding section -->
 <!-- enums in bindings -->
 <hr><h2 id="enums">Enums in binding</h2>
 
-<p>The name of the Color.Red enum is {{Color[Color.Red]}}</p>
+<p>
-<p>The current color number is {{color}}</p>
+  <!-- #docregion enums -->
-<p><button [style.color]="Color[color]" (click)="colorToggle()">Enum Toggle</button>
+  The name of the Color.Red enum is {{Color[Color.Red]}}.<br>
-
+  The current color is {{Color[color]}} and its number is {{color}}.<br>
-<a class="to-toc" href="#toc">top</a>
+  <button [style.color]="Color[color]" (click)="colorToggle()">Enum Toggle</button>
-
+  <!-- #enddocregion enums -->
-<!-- #docregion my-first-app -->
+</p>
-<h3>My First Angular Application</h3>
-<!-- #enddocregion my-first-app -->
 
 <a class="to-toc" href="#toc">top</a>

public/docs/_examples/template-syntax/ts/app/app.component.ts

@@ -77,6 +77,9 @@ export class AppComponent implements AfterViewInit, OnInit {
   heroImageUrl = 'images/hero.png';
 
   //iconUrl = 'https://angular.io/resources/images/logos/standard/shield-large.png';
+  clicked = '';
+  clickMessage = '';
+  clickMessage2 = '';
   iconUrl = 'images/ng-logo.png';
   isActive = false;
   isSpecial = true;

public/docs/dart/latest/_util-fns.jade

@@ -3,6 +3,7 @@ include ../../../_includes/_util-fns
 //- See the _util-fns file included above for a description of the use of these variables.
 - var _docsFor = 'dart';
 - var _decorator = 'annotation';
+- var _Array = 'List';
 - var _array = 'list';
 - var _an_array = 'a list'; //- Deprecate now that we have the articles
 - var _a = 'an';
@@ -12,6 +13,8 @@ include ../../../_includes/_util-fns
 - var _Promise = 'Future';
 - var _Observable = 'Stream';
 - var _liveLink = 'sample repo';
+- var _truthy = 'true';
+- var _falsey = 'false';
 
 mixin liveExampleLink(linkText, exampleUrlPartName)
   - var text = linkText || 'live example';

public/docs/dart/latest/guide/template-syntax.jade

@@ -1,407 +1,128 @@
-include ../_util-fns
+extends ../../../ts/latest/guide/template-syntax.jade
 
-+includeShared('{ts}', 'intro')
+block includes
+  include ../_util-fns
+  - var _JavaScript = 'Dart';
+  - var __chaining_op = '<code>;</code>';
+  - var __new_op = '<code>new</code> or <code>const</code>';
+  - var mapApiRef = 'https://api.dartlang.org/stable/1.16.0/dart-core/Map-class.html';
+  - var __objectAsMap = '<b><a href="' + mapApiRef + '">Map</a></b>'
 
-:marked
+block notable-differences
-  The complete source code for the example app in this chapter is
-  [in GitHub](https://github.com/angular/angular.io/tree/master/public/docs/_examples/template-syntax/dart).
-
-+includeShared('{ts}', 'html-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'my-first-app')(format=".")
-+includeShared('{ts}', 'html-2')
-
-+includeShared('{ts}', 'interpolation-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'first-interpolation')(format=".")
-+includeShared('{ts}', 'interpolation-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'title+image')(format=".")
-+includeShared('{ts}', 'interpolation-3')
-+makeExample('template-syntax/dart/lib/app_component.html', 'sum-1')(format=".")
-+includeShared('{ts}', 'interpolation-4')
-+makeExample('template-syntax/dart/lib/app_component.html', 'sum-2')(format=".")
-+includeShared('{ts}', 'interpolation-5')
-
-+includeShared('{ts}', 'template-expressions-1')
-:marked
-  We write template expressions in a language that looks like Dart.
-  Many Dart expressions are legal template expressions, but not all.
-  Dart expressions that have or promote side effects are prohibited,
-  including:
-
-  * assignments (`=`, `+=`, `-=`, ...)
-  * creating instances using `new` or `const`
-  * increment and decrement (`++` and `--`)
-
-  Other notable differences from Dart syntax include:
-
-  * no support for Dart string interpolation; for example,
-    instead of `"'The title is $title'"`, you must use
-    `"'The title is ' + title"`
-  * no support for the bitwise operators `|` and `&`
-  * new [template expression operators](#expression-operators), such as `|`
-+includeShared('{ts}', 'template-expressions-context')
-+includeShared('{ts}', 'template-expressions-guidelines')
-:marked
-  Dependent values should not change during a single turn of the event loop.
-  If an idempotent expression returns a string or a number, it returns the same string or number
-  when called twice in a row. If the expression returns an object (including a `DateTime`, `Map`, or `List`),
-  it returns the same object *reference* when called twice in a row.
-
-.callout.is-helpful
-  header Dart difference: Arrays are lists
   :marked
-    Arrays in JavaScript correspond to lists in Dart
+    * no support for Dart string interpolation; for example,
-    (instances of the `List` class).
+      instead of `"'The title is $title'"`, you must use
-    This chapter uses _array_ and _list_ interchangeably.
+      `"'The title is ' + title"`
-    For more information, see
+    * no support for the bitwise operators `|` and `&`
-    [Lists](https://www.dartlang.org/docs/dart-up-and-running/ch02.html#lists)
+    * new [template expression operators](#expression-operators), such as `|`
-    in the [Dart language tour](https://www.dartlang.org/docs/dart-up-and-running/ch02.html).
 
-+includeShared('{ts}', 'template-statements-1')
+block template-expressions-cannot
-:marked
-  Like template expressions, template *statements* use a language that looks like Dart.
-  The template statement parser is different than the template expression parser and
-  specifically supports both basic assignment (`=`) and chaining expressions with semicolons (`;`).
-
-  However, certain Dart syntax is not allowed:
-  * the `new` and `const` keywords
-  * increment and decrement operators, `++` and `--`
-  * operator assignment, such as `+=` and `-=`
-  * the operators `|` and `&` (neither for bitwise operations
-    nor for the Angular [pipe operator](#the-pipe-operator-))
-
-+includeShared('{ts}', 'template-statements-3')
-
-+includeShared('{ts}', 'binding-syntax-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'img+button')(format=".")
-+includeShared('{ts}', 'binding-syntax-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'hero-detail-1')(format=".")
-+includeShared('{ts}', 'binding-syntax-3')
-+makeExample('template-syntax/dart/lib/app_component.html', 'disabled-button-1')(format=".")
-+includeShared('{ts}', 'binding-syntax-4')
-+includeShared('{ts}', 'binding-syntax-attribute-vs-property')
-+includeShared('{ts}', 'binding-syntax-5')
-+includeShared('{ts}', 'binding-syntax-world-without-attributes')
-+includeShared('{ts}', 'binding-syntax-targets')
-
-<div width="90%">
-table
-  tr
-    th Binding type
-    th Target
-    th Examples
-  tr
-    td Property
-    td.
-      Element&nbsp;property<br>
-      Component&nbsp;property<br>
-      Directive&nbsp;property
-    td
-      +makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-syntax-1')(format=".")
-  tr
-    td Event
-    td.
-      Element&nbsp;event<br>
-      Component&nbsp;event<br>
-      Directive&nbsp;event
-    td
-      +makeExample('template-syntax/dart/lib/app_component.html', 'event-binding-syntax-1')(format=".")
-  tr
-    td Two-way
-    td.
-      Event and property
-    td
-      +makeExample('template-syntax/dart/lib/app_component.html', '2-way-binding-syntax-1')(format=".")
-  tr
-    td Attribute
-    td.
-      Attribute
-      (the&nbsp;exception)
-    td
-      +makeExample('template-syntax/dart/lib/app_component.html', 'attribute-binding-syntax-1')(format=".")
-  tr
-    td Class
-    td.
-      <code>class</code> property
-    td
-      +makeExample('template-syntax/dart/lib/app_component.html', 'class-binding-syntax-1')(format=".")
-  tr
-    td Style
-    td.
-      <code>style</code> property
-    td
-      +makeExample('template-syntax/dart/lib/app_component.html', 'style-binding-syntax-1')(format=".")
-</div>
-
-+includeShared('{ts}', 'binding-syntax-end')
-
-+includeShared('{ts}', 'property-binding-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-1')(format=".")
-+includeShared('{ts}', 'property-binding-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-2')(format=".")
-+includeShared('{ts}', 'property-binding-3')
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-3')(format=".")
-+includeShared('{ts}', 'property-binding-4')
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-4')(format=".")
-+includeShared('{ts}', 'property-binding-5')
-+includeShared('{ts}', 'property-binding-6')
-+includeShared('{ts}', 'property-binding-7')
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-1')(format=".")
-+includeShared('{ts}', 'property-binding-8')
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-5')(format=".")
-+includeShared('{ts}', 'property-binding-9')
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-3')(format=".")
-+includeShared('{ts}', 'property-binding-10')
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-4')(format=".")
-+includeShared('{ts}', 'property-binding-11')
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-6')(format=".")
-.callout.is-helpful
-  header Dart difference: Type exceptions
   :marked
-    In checked mode, uncommenting the `<hero-detail>` element above causes a type exception,
+    Perhaps more surprising, template expressions can’t refer to static
-    because `String` isn't a subtype of `Hero`.
+    properties, nor to top-level variables or functions, such as `window` or
-    For information on checked mode, see [Important concepts](https://www.dartlang.org/docs/dart-up-and-running/ch02.html#important-concepts)
+    `document` from `dart:html`. They can’t directly call `print` or functions
-    in the Dart language tour.
+    imported from `dart:math`. They are restricted to referencing members of
-+includeShared('{ts}', 'property-binding-12')
+    the expression context.
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-7')(format=".")
-+includeShared('{ts}', 'property-binding-13')
-+makeExample('template-syntax/dart/lib/app_component.html', 'property-binding-vs-interpolation')(format=".")
-+includeShared('{ts}', 'property-binding-14')
 
-+includeShared('{ts}', 'other-bindings-1')
+block statement-context
-+includeShared('{ts}', 'other-bindings-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'attrib-binding-colspan')(format=".")
-+includeShared('{ts}', 'other-bindings-3')
-+makeExample('template-syntax/dart/lib/app_component.html', 'attrib-binding-aria')(format=".")
-+includeShared('{ts}', 'other-bindings-class-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'class-binding-1')(format=".")
-+includeShared('{ts}', 'other-bindings-class-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'class-binding-2')(format=".")
-//
-  +includeShared('{ts}', 'other-bindings-class-3')
-:marked
-  Finally, we can bind to a specific class name.
-  Angular adds the class when the template expression evaluates to `true`.
-  It removes the class when the expression evaluates to `false`.
-+makeExample('template-syntax/dart/lib/app_component.html', 'class-binding-3')(format=".")
-+includeShared('{ts}', 'other-bindings-class-4')
-+includeShared('{ts}', 'other-bindings-style-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'style-binding-1')(format=".")
-+includeShared('{ts}', 'other-bindings-style-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'style-binding-2')(format=".")
-+includeShared('{ts}', 'other-bindings-style-3')
-
-+includeShared('{ts}', 'event-binding-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'event-binding-1')(format=".")
-+includeShared('{ts}', 'event-binding-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'event-binding-1')(format=".")
-+includeShared('{ts}', 'event-binding-3')
-+makeExample('template-syntax/dart/lib/app_component.html', 'event-binding-2')(format=".")
-+includeShared('{ts}', 'event-binding-4')
-+makeExample('template-syntax/dart/lib/app_component.html', 'event-binding-3')(format=".")
-+includeShared('{ts}', 'event-binding-5')
-+makeExample('template-syntax/dart/lib/app_component.html', 'without-NgModel')(format=".")
-+includeShared('{ts}', 'event-binding-6')
-+makeExample('template-syntax/dart/lib/hero_detail_component.dart',
-'template-1', 'HeroDetailComponent.ts (template)')(format=".")
-+makeExample('template-syntax/dart/lib/hero_detail_component.dart',
-'deleteRequest', 'HeroDetailComponent.ts (delete logic)')(format=".")
-+includeShared('{ts}', 'event-binding-7')
-+makeExample('template-syntax/dart/lib/app_component.html', 'event-binding-to-component')(format=".")
-+includeShared('{ts}', 'event-binding-8')
-
-+includeShared('{ts}', 'ngModel-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgModel-1')(format=".")
-+includeShared('{ts}', 'ngModel-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgModel-2')(format=".")
-+includeShared('{ts}', 'ngModel-3')
-+makeExample('template-syntax/dart/lib/app_component.html', 'without-NgModel')(format=".")
-+includeShared('{ts}', 'ngModel-4')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgModel-3')(format=".")
-+includeShared('{ts}', 'ngModel-5')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgModel-1')(format=".")
-+includeShared('{ts}', 'ngModel-6')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgModel-4')(format=".")
-+includeShared('{ts}', 'ngModel-7')
-
-+includeShared('{ts}', 'directives-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'event-binding-1')(format=".")
-+includeShared('{ts}', 'directives-2')
-+includeShared('{ts}', 'directives-ngClass-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'class-binding-3a')(format=".")
-+includeShared('{ts}', 'directives-ngClass-2')
-+makeExample('template-syntax/dart/lib/app_component.dart', 'setClasses')(format=".")
-// PENDING: Add "Dart difference" for returning maps in Dart? for omitting unnecessary `this.`s?
-+includeShared('{ts}', 'directives-ngClass-3')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgClass-1')(format=".")
-+includeShared('{ts}', 'directives-ngStyle-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgStyle-1')(format=".")
-+includeShared('{ts}', 'directives-ngStyle-2')
-+makeExample('template-syntax/dart/lib/app_component.dart', 'setStyles')(format=".")
-+includeShared('{ts}', 'directives-ngStyle-3')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgStyle-2')(format=".")
-//
-  +includeShared('{ts}', 'directives-ngIf-1')
-<a id="ngIf"></a>
-.l-main-section
-:marked
-  ### NgIf
-  We can add an element subtree (an element and its children) to the DOM  by binding an `NgIf` directive to a `true` expression.
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgIf-1')(format=".")
-+includeShared('{ts}', 'directives-ngIf-2')
-//
-  +includeShared('{ts}', 'directives-ngIf-3')
-:marked
-  Binding to a false expression removes the element subtree from the DOM.
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgIf-2')(format=".")
-.callout.is-helpful
-  header Dart difference: No truthy values
   :marked
-    In checked mode, Dart expects Boolean values
+    Template statements can’t refer to static properties on the class, nor to
-    (those with type `bool`) to be either `true` or `false`.
+    top-level variables or functions, such as `window` or `document` from
-    Even in production mode, the only value Dart treats as `true` is
+    `dart:html`. They can’t directly call `print` or functions imported from
-    the value `true`; all other values are `false`.
+    `dart:math`.
-    TypeScript and JavaScript, on the other hand, treat
-    many values (including non-null objects) as true.
-    A TypeScript Angular 2 program, for example, often has code like
-    `*ngIf="currentHero"` where a Dart program has code like
-    `*ngIf="currentHero != null"`.
 
-    When converting TypeScript code to Dart code, watch out for
+block dart-type-exceptions
-    true/false problems. For example, forgetting the `!= null`
+  .callout.is-helpful
-    can lead to exceptions in checked mode, such as
+    header Dart difference: Type exceptions
-    "EXCEPTION: type 'Hero' is not a subtype of type 'bool' of 'boolean expression'".
+    :marked
-    For more information, see
+      In checked mode, if the template expression result type and the target
-    [Booleans](https://www.dartlang.org/docs/dart-up-and-running/ch02.html#booleans)
+      property type are not assignment compatible, then a type exception will
-    in the [Dart language tour](https://www.dartlang.org/docs/dart-up-and-running/ch02.html).
+      be thrown.
-+includeShared('{ts}', 'directives-ngIf-4')
+      For information on checked mode, see [Important concepts](https://www.dartlang.org/docs/dart-up-and-running/ch02.html#important-concepts)
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgIf-3')(format=".")
+      in the Dart language tour.
-+includeShared('{ts}', 'directives-ngIf-5')
-+includeShared('{ts}', 'directives-ngSwitch-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgSwitch')(format=".")
-+includeShared('{ts}', 'directives-ngSwitch-2')
-+includeShared('{ts}', 'directives-ngFor-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgFor-1')(format=".")
-+includeShared('{ts}', 'directives-ngFor-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgFor-2')(format=".")
-+includeShared('{ts}', 'directives-ngFor-3')
-+includeShared('{ts}', 'directives-ngFor-4')
-+includeShared('{ts}', 'directives-ngFor-5')
-+includeShared('{ts}', 'directives-ngFor-6')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgFor-3')(format=".")
-+includeShared('{ts}', 'directives-ngFor-7')
-+includeShared('{ts}', 'directives-ngForTrackBy-1')
-+makeExample('template-syntax/dart/lib/app_component.dart', 'trackByHeroes')(format=".")
-+includeShared('{ts}', 'directives-ngForTrackBy-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgForTrackBy-2')(format=".")
-+includeShared('{ts}', 'directives-ngForTrackBy-3')
 
-+includeShared('{ts}', 'star-template')
+block dart-type-exception-example
-+includeShared('{ts}', 'star-template-ngIf-1')
+  .callout.is-helpful
-+makeExample('template-syntax/dart/lib/app_component.html', 'Template-1')(format=".")
+    header Dart difference: Type exception example
-+includeShared('{ts}', 'star-template-ngIf-2a')
+    :marked
-+makeExample('template-syntax/dart/lib/app_component.html', 'Template-2a')(format=".")
+      In checked mode, the code above will result in a type exception: 
-+includeShared('{ts}', 'star-template-ngIf-2')
+      `String` isn't a subtype of `Hero`.
-+makeExample('template-syntax/dart/lib/app_component.html', 'Template-2')(format=".")
+
-+includeShared('{ts}', 'star-template-ngIf-3')
+block dart-class-binding-bug
-// Changed from RED to ORANGE, since this isn't so dire a situation in Dart.
+  .callout.is-helpful
-.callout.is-important
+    header Angular Issue #6901
-  header Remember the brackets!
+    :marked
+      Issue [#6901][6901] prevents us from using `[class]`. As is illustrated
+      above, in the meantime we can achieve the same effect by binding to
+      `className`.
+      
+      [6901]: http://github.com/angular/angular/issues/6901
+
+block style-property-name-dart-diff
+  .callout.is-helpful
+    header Dart difference: Style property names
+    :marked
+      While [camelCase](glossary.html#camelcase) and
+      [dash-case](glossary.html#dash-case) style property naming schemes are
+      equivalent in Angular Dart, only dash-case names are recognized by the
+      `dart:html` [CssStyleDeclaration][CssSD] methods `getPropertyValue()`
+      and `setProperty()`. Hence, we recommend only using dash-case for style
+      property names.
+      
+      [CssSD]: https://api.dartlang.org/stable/1.16.1/dart-html/CssStyleDeclaration-class.html
+
+
+block dart-no-truthy-falsey
+  .callout.is-helpful
+    header Dart difference: No truthy/falsey values
+    :marked
+      In checked mode, Dart expects Boolean values
+      (those with type `bool`) to be either `true` or `false`.
+      Even in production mode, the only value Dart treats as `true` is
+      the value `true`; all other values are `false`.
+      TypeScript and JavaScript, on the other hand, treat
+      many values (including non-null objects) as true.
+      A TypeScript Angular 2 program, for example, often has code like
+      `*ngIf="currentHero"` where a Dart program has code like
+      `*ngIf="currentHero != null"`.
+
+      When converting TypeScript code to Dart code, watch out for
+      true/false problems. For example, forgetting the `!= null`
+      can lead to exceptions in checked mode, such as
+      "EXCEPTION: type 'Hero' is not a subtype of type 'bool' of 'boolean expression'".
+      For more information, see
+      [Booleans](https://www.dartlang.org/docs/dart-up-and-running/ch02.html#booleans)
+      in the [Dart language tour](https://www.dartlang.org/docs/dart-up-and-running/ch02.html).
+
+block remember-the-brackets
+  //- Changed from RED to ORANGE, since this isn't so dire a situation in Dart.
+  .callout.is-important
+    header Remember the brackets!
+    :marked
+      Don’t make the mistake of writing `ngIf="currentHero"`!
+      That syntax assigns the *string* value `"currentHero"` to `ngIf`,
+      which won't work because `ngIf` expects a `bool`.
+
+block dart-safe-nav-op
+  .callout.is-helpful
+    header Dart difference: ?. is a Dart operator
+    :marked
+      The safe navigation operator (`?.`) is part of the Dart language.
+      It's considered a template expression operator because
+      Angular 2 supports `?.` even in TypeScript and JavaScript apps.
+
+block json-pipe
+  //- TODO: explain alternative in Dart
+  //- {{ e | json }} --> {{ e }}
+  //- which causes the object's toString() method to be invoked.
+  //- Of course the `json` pipe can be used if the instance supports
+  //- JSON encoding.
+
+block null-deref-example
   :marked
-    Don’t make the mistake of writing `ngIf="currentHero"`!
+    Dart throws an exception, and so does Angular:
-    That syntax assigns the *string* value "currentHero" to `ngIf`,
+  code-example(format="nocode").
-    which won't work because `ngIf` expects a bool.
+    EXCEPTION: The null object does not have a getter 'firstName'.
-+includeShared('{ts}', 'star-template-ngSwitch-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'NgSwitch-expanded')(format=".")
-+includeShared('{ts}', 'star-template-ngSwitch-2')
-+includeShared('{ts}', 'star-template-ngFor-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'Template-3a')(format=".")
-+includeShared('{ts}', 'star-template-ngFor-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'Template-3')(format=".")
-+includeShared('{ts}', 'star-template-ngFor-3')
-+makeExample('template-syntax/dart/lib/app_component.html', 'Template-4')(format=".")
-+includeShared('{ts}', 'star-template-ngFor-4')
 
-+includeShared('{ts}', 'ref-vars')
+block safe-op-alt
-+makeExample('template-syntax/dart/lib/app_component.html', 'ref-phone')(format=".")
+  //- N/A
-+includeShared('{ts}', 'ref-vars-value')
-+includeShared('{ts}', 'ref-vars-form-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'ref-form')(format=".")
-+includeShared('{ts}', 'ref-vars-form-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'ref-form-a')(format=".")
-+includeShared('{ts}', 'ref-vars-form-3')
-
-+includeShared('{ts}', 'inputs-outputs-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'io-1')(format=".")
-+includeShared('{ts}', 'inputs-outputs-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'io-2')(format=".")
-+includeShared('{ts}', 'inputs-outputs-3')
-+makeExample('template-syntax/dart/lib/hero_detail_component.dart', 'input-output-1')(format=".")
-:marked
-.l-sub-section
-  :marked
-    Alternatively, we can identify members in the `inputs` and `outputs` arrays
-    of the directive metadata, as in this example:
-  +makeExample('template-syntax/dart/lib/hero_detail_component.dart', 'input-output-2')(format=".")
-  <br>
-  :marked
-    We can specify an input/output property either with a decorator or in a metadata array.
-    Don't do both!
-+includeShared('{ts}', 'inputs-outputs-4')
-+includeShared('{ts}', 'inputs-outputs-5')
-+makeExample('template-syntax/dart/lib/app_component.html', 'my-click')(format=".")
-+includeShared('{ts}', 'inputs-outputs-6')
-+makeExample('template-syntax/dart/lib/my_click_directive.dart', 'my-click-output-1')(format=".")
-.l-sub-section
-  :marked
-    We can also alias property names in the `inputs` and `outputs` arrays.
-    We write a colon-delimited (`:`) string with
-    the directive property name on the *left* and the public alias on the *right*:
-  +makeExample('template-syntax/dart/lib/my_click_directive.dart', 'my-click-output-2')(format=".")
-
-<a id="expression-operators"></a>
-.l-main-section
-:marked
-  ## Template expression operators
-  The template expression language employs a subset of Dart syntax supplemented with a few special operators
-  for specific scenarios. We'll cover two of these operators: _pipe_ and _safe navigation operator_.
-.callout.is-helpful
-  header Dart difference: ?. is a Dart operator
-  :marked
-    The safe navigation operator (`?.`) is part of the Dart language.
-    It's considered a template expression operator because
-    Angular 2 supports `?.` even in TypeScript and JavaScript apps.
-+includeShared('{ts}', 'expression-operators-pipe-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'pipes-1')(format=".")
-+includeShared('{ts}', 'expression-operators-pipe-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'pipes-2')(format=".")
-+includeShared('{ts}', 'expression-operators-pipe-3')
-+makeExample('template-syntax/dart/lib/app_component.html', 'pipes-3')(format=".")
-//
-  NOTE: Intentionally omit discussion of the json pipe.
-  +includeShared('{ts}', 'expression-operators-pipe-4')
-  +makeExample('template-syntax/dart/lib/app_component.html', 'pipes-json')(format=".")
-+includeShared('{ts}', 'expression-operators-safe-1')
-+makeExample('template-syntax/dart/lib/app_component.html', 'safe-2')(format=".")
-+includeShared('{ts}', 'expression-operators-safe-2')
-+makeExample('template-syntax/dart/lib/app_component.html', 'safe-1')(format=".")
-+includeShared('{ts}', 'expression-operators-safe-3')
-// +includeShared('{ts}', 'expression-operators-safe-4')
-:marked
-  Dart throws an exception, and so does Angular:
-code-example(format="" language="html").
-  EXCEPTION: The null object does not have a getter 'firstName'.
-+includeShared('{ts}', 'expression-operators-safe-5')
-+makeExample('template-syntax/dart/lib/app_component.html', 'safe-4')(format=".")
-
-//
-  NOTE: Intentionally skip ugly null checking you wouldn't do in Dart.
-  That means skipping the shared sections 'expression-operators-safe-6' & 7,
-  plus the example 'safe-5'.
-:marked
-  This approach has merit but can be cumbersome, especially if the property path is long.
-  Imagine guarding against a null somewhere in a long property path such as `a.b.c.d`.
-+includeShared('{ts}', 'expression-operators-safe-8')
-+makeExample('template-syntax/dart/lib/app_component.html', 'safe-6')(format=".")
-+includeShared('{ts}', 'expression-operators-safe-9')
-
-+includeShared('{ts}', 'summary')