diff --git a/modules/@angular/core/src/linker/element_injector.ts b/modules/@angular/core/src/linker/element_injector.ts
index bb7a7d53b6..10f1c248fa 100644
--- a/modules/@angular/core/src/linker/element_injector.ts
+++ b/modules/@angular/core/src/linker/element_injector.ts
@@ -9,8 +9,6 @@
 import {Injector, THROW_IF_NOT_FOUND} from '../di/injector';
 import {AppView} from './view';
 
-const _UNDEFINED = new Object();
-
 export class ElementInjector extends Injector {
   constructor(private _view: AppView<any>, private _nodeIndex: number) { super(); }
 
diff --git a/modules/@angular/core/src/linker/view.ts b/modules/@angular/core/src/linker/view.ts
index 5c76cba583..67b084b4d4 100644
--- a/modules/@angular/core/src/linker/view.ts
+++ b/modules/@angular/core/src/linker/view.ts
@@ -9,7 +9,6 @@
 import {ApplicationRef} from '../application_ref';
 import {ChangeDetectorRef, ChangeDetectorStatus} from '../change_detection/change_detection';
 import {Injector, THROW_IF_NOT_FOUND} from '../di/injector';
-import {ListWrapper} from '../facade/collection';
 import {isPresent} from '../facade/lang';
 import {WtfScopeFn, wtfCreateScope, wtfLeave} from '../profile/profile';
 import {DirectRenderer, RenderComponentType, RenderDebugInfo, Renderer} from '../render/api';
diff --git a/modules/@angular/router/src/apply_redirects.ts b/modules/@angular/router/src/apply_redirects.ts
index bce789e881..d4dabdb987 100644
--- a/modules/@angular/router/src/apply_redirects.ts
+++ b/modules/@angular/router/src/apply_redirects.ts
@@ -18,7 +18,7 @@ import {map} from 'rxjs/operator/map';
 import {mergeMap} from 'rxjs/operator/mergeMap';
 import {EmptyError} from 'rxjs/util/EmptyError';
 
-import {Route, Routes, UrlMatchResult} from './config';
+import {Route, Routes} from './config';
 import {LoadedRouterConfig, RouterConfigLoader} from './router_config_loader';
 import {NavigationCancelingError, PRIMARY_OUTLET, Params, defaultUrlMatcher} from './shared';
 import {UrlSegment, UrlSegmentGroup, UrlSerializer, UrlTree} from './url_tree';
@@ -54,7 +54,6 @@ function canLoadFails(route: Route): Observable<LoadedRouterConfig> {
           `Cannot load children because the guard of the route "path: '${route.path}'" returned false`)));
 }
 
-
 export function applyRedirects(
     injector: Injector, configLoader: RouterConfigLoader, urlSerializer: UrlSerializer,
     urlTree: UrlTree, config: Routes): Observable<UrlTree> {
diff --git a/modules/@angular/router/src/create_url_tree.ts b/modules/@angular/router/src/create_url_tree.ts
index b3e2dc3aa3..3c7dda40b3 100644
--- a/modules/@angular/router/src/create_url_tree.ts
+++ b/modules/@angular/router/src/create_url_tree.ts
@@ -9,7 +9,7 @@
 import {ActivatedRoute} from './router_state';
 import {PRIMARY_OUTLET, Params} from './shared';
 import {UrlSegment, UrlSegmentGroup, UrlTree} from './url_tree';
-import {forEach, shallowEqual} from './utils/collection';
+import {forEach, shallowEqual, last} from './utils/collection';
 
 export function createUrlTree(
     route: ActivatedRoute, urlTree: UrlTree, commands: any[], queryParams: Params,
@@ -18,36 +18,24 @@ export function createUrlTree(
     return tree(urlTree.root, urlTree.root, urlTree, queryParams, fragment);
   }
 
-  const normalizedCommands = normalizeCommands(commands);
-  validateCommands(normalizedCommands);
+  const nav = computeNavigation(commands);
 
-  if (navigateToRoot(normalizedCommands)) {
+  if (nav.toRoot()) {
     return tree(urlTree.root, new UrlSegmentGroup([], {}), urlTree, queryParams, fragment);
   }
 
-  const startingPosition = findStartingPosition(normalizedCommands, urlTree, route);
+  const startingPosition = findStartingPosition(nav, urlTree, route);
+
   const segmentGroup = startingPosition.processChildren ?
       updateSegmentGroupChildren(
-          startingPosition.segmentGroup, startingPosition.index, normalizedCommands.commands) :
+          startingPosition.segmentGroup, startingPosition.index, nav.commands) :
       updateSegmentGroup(
-          startingPosition.segmentGroup, startingPosition.index, normalizedCommands.commands);
+          startingPosition.segmentGroup, startingPosition.index, nav.commands);
   return tree(startingPosition.segmentGroup, segmentGroup, urlTree, queryParams, fragment);
 }
 
-function validateCommands(n: NormalizedNavigationCommands): void {
-  if (n.isAbsolute && n.commands.length > 0 && isMatrixParams(n.commands[0])) {
-    throw new Error('Root segment cannot have matrix parameters');
-  }
-
-  const c = n.commands.filter(c => typeof c === 'object' && c.outlets !== undefined);
-  if (c.length > 0 && c[0] !== n.commands[n.commands.length - 1]) {
-    throw new Error('{outlets:{}} has to be the last command');
-  }
-}
-
 function isMatrixParams(command: any): boolean {
-  return typeof command === 'object' && command.outlets === undefined &&
-      command.segmentPath === undefined;
+  return typeof command === 'object' && !command.outlets && !command.segmentPath;
 }
 
 function tree(
@@ -55,11 +43,11 @@ function tree(
     queryParams: Params, fragment: string): UrlTree {
   if (urlTree.root === oldSegmentGroup) {
     return new UrlTree(newSegmentGroup, stringify(queryParams), fragment);
-  } else {
-    return new UrlTree(
-        replaceSegment(urlTree.root, oldSegmentGroup, newSegmentGroup), stringify(queryParams),
-        fragment);
   }
+
+  return new UrlTree(
+      replaceSegment(urlTree.root, oldSegmentGroup, newSegmentGroup), stringify(queryParams),
+      fragment);
 }
 
 function replaceSegment(
@@ -76,72 +64,71 @@ function replaceSegment(
   return new UrlSegmentGroup(current.segments, children);
 }
 
-function navigateToRoot(normalizedChange: NormalizedNavigationCommands): boolean {
-  return normalizedChange.isAbsolute && normalizedChange.commands.length === 1 &&
-      normalizedChange.commands[0] == '/';
+class Navigation {
+  constructor(public isAbsolute: boolean, public numberOfDoubleDots: number, public commands: any[]) {
+    if (isAbsolute && commands.length > 0 && isMatrixParams(commands[0])) {
+      throw new Error('Root segment cannot have matrix parameters');
+    }
+
+    const cmdWithOutlet = commands.find(c => typeof c === 'object' && c.outlets);
+    if (cmdWithOutlet && cmdWithOutlet !== last(commands)) {
+      throw new Error('{outlets:{}} has to be the last command');
+    }
+  }
+
+  public toRoot(): boolean {
+    return this.isAbsolute && this.commands.length === 1 && this.commands[0] == '/';
+  }
 }
 
-class NormalizedNavigationCommands {
-  constructor(
-      public isAbsolute: boolean, public numberOfDoubleDots: number, public commands: any[]) {}
-}
-
-function normalizeCommands(commands: any[]): NormalizedNavigationCommands {
-  if ((typeof commands[0] === 'string') && commands.length === 1 && commands[0] == '/') {
-    return new NormalizedNavigationCommands(true, 0, commands);
+/** Transforms commands to a normalized `Navigation` */
+function computeNavigation(commands: any[]): Navigation {
+  if ((typeof commands[0] === 'string') && commands.length === 1 && commands[0] === '/') {
+    return new Navigation(true, 0, commands);
   }
 
   let numberOfDoubleDots = 0;
   let isAbsolute = false;
-  const res: any[] = [];
 
-  for (let i = 0; i < commands.length; ++i) {
-    const c = commands[i];
+  const res: any[] = commands.reduce((res, cmd, cmdIdx) => {
+    if (typeof cmd === 'object') {
+      if (cmd.outlets) {
+        const outlets: {[k: string]: any} = {};
+        forEach(cmd.outlets, (commands: any, name: string) => {
+          outlets[name] = typeof commands === 'string' ? commands.split('/') : commands;
+        });
+        return [...res, {outlets}];
+      }
 
-    if (typeof c === 'object' && c.outlets !== undefined) {
-      const r: {[k: string]: any} = {};
-      forEach(c.outlets, (commands: any, name: string) => {
-        if (typeof commands === 'string') {
-          r[name] = commands.split('/');
-        } else {
-          r[name] = commands;
+      if (cmd.segmentPath) {
+        return [...res, cmd.segmentPath];
+      }
+    }
+
+    if (!(typeof cmd === 'string')) {
+      return [...res, cmd];
+    }
+
+    if (cmdIdx === 0) {
+      cmd.split('/').forEach((urlPart, partIndex) => {
+        if (partIndex == 0 && urlPart === '.') {
+          // skip './a'
+        } else if (partIndex == 0 && urlPart === '') {  //  '/a'
+          isAbsolute = true;
+        } else if (urlPart === '..') {  //  '../a'
+          numberOfDoubleDots++;
+        } else if (urlPart != '') {
+          res.push(urlPart);
         }
       });
-      res.push({outlets: r});
-      continue;
+
+      return res;
     }
 
-    if (typeof c === 'object' && c.segmentPath !== undefined) {
-      res.push(c.segmentPath);
-      continue;
-    }
+    return [...res, cmd];
+  }, []);
 
-    if (!(typeof c === 'string')) {
-      res.push(c);
-      continue;
-    }
-
-    if (i === 0) {
-      const parts = c.split('/');
-      for (let j = 0; j < parts.length; ++j) {
-        const cc = parts[j];
-
-        if (j == 0 && cc == '.') {  //  './a'
-          // skip it
-        } else if (j == 0 && cc == '') {  //  '/a'
-          isAbsolute = true;
-        } else if (cc == '..') {  //  '../a'
-          numberOfDoubleDots++;
-        } else if (cc != '') {
-          res.push(cc);
-        }
-      }
-    } else {
-      res.push(c);
-    }
-  }
-
-  return new NormalizedNavigationCommands(isAbsolute, numberOfDoubleDots, res);
+  return new Navigation(isAbsolute, numberOfDoubleDots, res);
 }
 
 class Position {
@@ -150,19 +137,19 @@ class Position {
   }
 }
 
-function findStartingPosition(
-    normalizedChange: NormalizedNavigationCommands, urlTree: UrlTree,
-    route: ActivatedRoute): Position {
-  if (normalizedChange.isAbsolute) {
-    return new Position(urlTree.root, true, 0);
-  } else if (route.snapshot._lastPathIndex === -1) {
-    return new Position(route.snapshot._urlSegment, true, 0);
-  } else {
-    const modifier = isMatrixParams(normalizedChange.commands[0]) ? 0 : 1;
-    const index = route.snapshot._lastPathIndex + modifier;
-    return createPositionApplyingDoubleDots(
-        route.snapshot._urlSegment, index, normalizedChange.numberOfDoubleDots);
+function findStartingPosition(nav: Navigation, tree: UrlTree, route: ActivatedRoute): Position {
+  if (nav.isAbsolute) {
+    return new Position(tree.root, true, 0);
   }
+
+  if (route.snapshot._lastPathIndex === -1) {
+    return new Position(route.snapshot._urlSegment, true, 0);
+  }
+
+  const modifier = isMatrixParams(nav.commands[0]) ? 0 : 1;
+  const index = route.snapshot._lastPathIndex + modifier;
+  return createPositionApplyingDoubleDots(route.snapshot._urlSegment, index, nav.numberOfDoubleDots);
+
 }
 
 function createPositionApplyingDoubleDots(
@@ -276,7 +263,7 @@ function createNewSegmentGroup(
   let i = 0;
   while (i < commands.length) {
     if (typeof commands[i] === 'object' && commands[i].outlets !== undefined) {
-      const children = createNewSegmentChldren(commands[i].outlets);
+      const children = createNewSegmentChildren(commands[i].outlets);
       return new UrlSegmentGroup(paths, children);
     }
 
@@ -301,7 +288,7 @@ function createNewSegmentGroup(
   return new UrlSegmentGroup(paths, {});
 }
 
-function createNewSegmentChldren(outlets: {[name: string]: any}): any {
+function createNewSegmentChildren(outlets: {[name: string]: any}): any {
   const children: {[key: string]: UrlSegmentGroup} = {};
   forEach(outlets, (commands: any, outlet: string) => {
     if (commands !== null) {
diff --git a/modules/@angular/router/src/private_export.ts b/modules/@angular/router/src/private_export.ts
index dfe3a0582e..e6f8bdfdbf 100644
--- a/modules/@angular/router/src/private_export.ts
+++ b/modules/@angular/router/src/private_export.ts
@@ -12,9 +12,12 @@ import {ROUTES} from './router_config_loader';
 import {ROUTER_PROVIDERS} from './router_module';
 import {flatten} from './utils/collection';
 
-export var __router_private__:
-    {ROUTER_PROVIDERS: typeof ROUTER_PROVIDERS; ROUTES: typeof ROUTES; flatten: typeof flatten;} = {
-      ROUTER_PROVIDERS: ROUTER_PROVIDERS,
-      ROUTES: ROUTES,
-      flatten: flatten
-    };
+export const __router_private__: {
+  ROUTER_PROVIDERS: typeof ROUTER_PROVIDERS,
+  ROUTES: typeof ROUTES,
+  flatten: typeof flatten,
+} = {
+  ROUTER_PROVIDERS: ROUTER_PROVIDERS,
+  ROUTES: ROUTES,
+  flatten: flatten,
+};
diff --git a/modules/@angular/router/src/private_import_platform-browser.ts b/modules/@angular/router/src/private_import_platform-browser.ts
index 1b82a8c95e..e1001c4b37 100644
--- a/modules/@angular/router/src/private_import_platform-browser.ts
+++ b/modules/@angular/router/src/private_import_platform-browser.ts
@@ -7,4 +7,4 @@
  */
 import {__platform_browser_private__ as r} from '@angular/platform-browser';
 
-export var getDOM: typeof r.getDOM = r.getDOM;
+export const getDOM: typeof r.getDOM = r.getDOM;
diff --git a/modules/@angular/router/src/recognize.ts b/modules/@angular/router/src/recognize.ts
index 3bd8c16de9..56aa62cfe3 100644
--- a/modules/@angular/router/src/recognize.ts
+++ b/modules/@angular/router/src/recognize.ts
@@ -11,9 +11,9 @@ import {Observable} from 'rxjs/Observable';
 import {Observer} from 'rxjs/Observer';
 import {of } from 'rxjs/observable/of';
 
-import {Data, ResolveData, Route, Routes, UrlMatchResult} from './config';
+import {Data, ResolveData, Route, Routes} from './config';
 import {ActivatedRouteSnapshot, RouterStateSnapshot, inheritedParamsDataResolve} from './router_state';
-import {PRIMARY_OUTLET, Params, defaultUrlMatcher} from './shared';
+import {PRIMARY_OUTLET, defaultUrlMatcher} from './shared';
 import {UrlSegment, UrlSegmentGroup, UrlTree, mapChildrenIntoArray} from './url_tree';
 import {forEach, last, merge} from './utils/collection';
 import {TreeNode} from './utils/tree';
diff --git a/modules/@angular/router/src/route_reuse_strategy.ts b/modules/@angular/router/src/route_reuse_strategy.ts
index 150d6d8084..f733b06dc6 100644
--- a/modules/@angular/router/src/route_reuse_strategy.ts
+++ b/modules/@angular/router/src/route_reuse_strategy.ts
@@ -11,7 +11,6 @@ import {ComponentRef} from '@angular/core';
 import {ActivatedRoute, ActivatedRouteSnapshot} from './router_state';
 import {TreeNode} from './utils/tree';
 
-
 /**
  * @whatItDoes Represents the detached route tree.
  *
@@ -22,43 +21,30 @@ import {TreeNode} from './utils/tree';
  */
 export type DetachedRouteHandle = {};
 
-/**
- * @internal
- */
+/** @internal */
 export type DetachedRouteHandleInternal = {
   componentRef: ComponentRef<any>,
-  route: TreeNode<ActivatedRoute>
+  route: TreeNode<ActivatedRoute>,
 };
 
-
 /**
  * @whatItDoes Provides a way to customize when activated routes get reused.
  *
  * @experimental
  */
 export abstract class RouteReuseStrategy {
-  /**
-   * Determines if this route (and its subtree) should be detached to be reused later.
-   */
+  /** Determines if this route (and its subtree) should be detached to be reused later */
   abstract shouldDetach(route: ActivatedRouteSnapshot): boolean;
 
-  /**
-   * Stores the detached route.
-   */
+  /** Stores the detached route */
   abstract store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle): void;
 
-  /**
-   * Determines if this route (and its subtree) should be reattached.
-   */
+  /** Determines if this route (and its subtree) should be reattached */
   abstract shouldAttach(route: ActivatedRouteSnapshot): boolean;
 
-  /**
-   * Retrieves the previously stored route.
-   */
+  /** Retrieves the previously stored route */
   abstract retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle;
 
-  /**
-   * Determines if a route should be reused.
-   */
+  /** Determines if a route should be reused */
   abstract shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean;
 }
\ No newline at end of file
diff --git a/modules/@angular/router/src/router.ts b/modules/@angular/router/src/router.ts
index b6f64aa117..48c7506c9c 100644
--- a/modules/@angular/router/src/router.ts
+++ b/modules/@angular/router/src/router.ts
@@ -13,7 +13,6 @@ import {Observable} from 'rxjs/Observable';
 import {Subject} from 'rxjs/Subject';
 import {Subscription} from 'rxjs/Subscription';
 import {from} from 'rxjs/observable/from';
-import {fromPromise} from 'rxjs/observable/fromPromise';
 import {of } from 'rxjs/observable/of';
 import {concatMap} from 'rxjs/operator/concatMap';
 import {every} from 'rxjs/operator/every';
@@ -148,7 +147,6 @@ export class NavigationStart {
   constructor(
       /** @docsNotRequired */
       public id: number,
-
       /** @docsNotRequired */
       public url: string) {}
 
@@ -166,10 +164,8 @@ export class NavigationEnd {
   constructor(
       /** @docsNotRequired */
       public id: number,
-
       /** @docsNotRequired */
       public url: string,
-
       /** @docsNotRequired */
       public urlAfterRedirects: string) {}
 
@@ -189,10 +185,8 @@ export class NavigationCancel {
   constructor(
       /** @docsNotRequired */
       public id: number,
-
       /** @docsNotRequired */
       public url: string,
-
       /** @docsNotRequired */
       public reason: string) {}
 
@@ -210,10 +204,8 @@ export class NavigationError {
   constructor(
       /** @docsNotRequired */
       public id: number,
-
       /** @docsNotRequired */
       public url: string,
-
       /** @docsNotRequired */
       public error: any) {}
 
@@ -233,7 +225,6 @@ export class RoutesRecognized {
   constructor(
       /** @docsNotRequired */
       public id: number,
-
       /** @docsNotRequired */
       public url: string,
       /** @docsNotRequired */
@@ -282,7 +273,7 @@ type NavigationParams = {
   resolve: any,
   reject: any,
   promise: Promise<boolean>,
-  imperative: boolean
+  imperative: boolean,
 };
 
 
@@ -312,9 +303,8 @@ export class Router {
   private currentUrlTree: UrlTree;
   private rawUrlTree: UrlTree;
 
-  private navigations: BehaviorSubject<NavigationParams> =
-      new BehaviorSubject<NavigationParams>(null);
-  private routerEvents: Subject<Event> = new Subject<Event>();
+  private navigations = new BehaviorSubject<NavigationParams>(null);
+  private routerEvents = new Subject<Event>();
 
   private currentRouterState: RouterState;
   private locationSubscription: Subscription;
@@ -353,7 +343,6 @@ export class Router {
     this.rawUrlTree = this.currentUrlTree;
     this.configLoader = new RouterConfigLoader(loader, compiler);
     this.currentRouterState = createEmptyState(this.currentUrlTree, this.rootComponentType);
-
     this.processNavigations();
   }
 
@@ -403,19 +392,13 @@ export class Router {
     }
   }
 
-  /**
-   * Returns the current route state.
-   */
+  /** The current route state */
   get routerState(): RouterState { return this.currentRouterState; }
 
-  /**
-   * Returns the current url.
-   */
+  /** The current url */
   get url(): string { return this.serializeUrl(this.currentUrlTree); }
 
-  /**
-   * Returns an observable of route events
-   */
+  /** An observable of router events */
   get events(): Observable<Event> { return this.routerEvents; }
 
   /**
@@ -428,7 +411,7 @@ export class Router {
    *  { path: 'team/:id', component: TeamCmp, children: [
    *    { path: 'simple', component: SimpleCmp },
    *    { path: 'user/:name', component: UserCmp }
-   *  ] }
+   *  ]}
    * ]);
    * ```
    */
@@ -437,14 +420,10 @@ export class Router {
     this.config = config;
   }
 
-  /**
-   * @docsNotRequired
-   */
+  /** @docsNotRequired */
   ngOnDestroy() { this.dispose(); }
 
-  /**
-   * Disposes of the router.
-   */
+  /** Disposes of the router */
   dispose(): void {
     if (this.locationSubscription) {
       this.locationSubscription.unsubscribe();
@@ -496,7 +475,7 @@ export class Router {
   createUrlTree(
       commands: any[], {relativeTo, queryParams, fragment, preserveQueryParams,
                         preserveFragment}: NavigationExtras = {}): UrlTree {
-    const a = relativeTo ? relativeTo : this.routerState.root;
+    const a = relativeTo || this.routerState.root;
     const q = preserveQueryParams ? this.currentUrlTree.queryParams : queryParams;
     const f = preserveFragment ? this.currentUrlTree.fragment : fragment;
     return createUrlTree(a, this.currentUrlTree, commands, q, f);
@@ -506,9 +485,9 @@ export class Router {
    * Navigate based on the provided url. This navigation is always absolute.
    *
    * Returns a promise that:
-   * - is resolved with 'true' when navigation succeeds
-   * - is resolved with 'false' when navigation fails
-   * - is rejected when an error happens
+   * - resolves to 'true' when navigation succeeds,
+   * - resolves to 'false' when navigation fails,
+   * - is rejected when an error happens.
    *
    * ### Usage
    *
@@ -527,11 +506,11 @@ export class Router {
     if (url instanceof UrlTree) {
       return this.scheduleNavigation(
           this.urlHandlingStrategy.merge(url, this.rawUrlTree), true, extras);
-    } else {
-      const urlTree = this.urlSerializer.parse(url);
-      return this.scheduleNavigation(
-          this.urlHandlingStrategy.merge(urlTree, this.rawUrlTree), true, extras);
     }
+
+    const urlTree = this.urlSerializer.parse(url);
+    return this.scheduleNavigation(
+        this.urlHandlingStrategy.merge(urlTree, this.rawUrlTree), true, extras);
   }
 
   /**
@@ -539,9 +518,9 @@ export class Router {
    * If no starting route is provided, the navigation is absolute.
    *
    * Returns a promise that:
-   * - is resolved with 'true' when navigation succeeds
-   * - is resolved with 'false' when navigation fails
-   * - is rejected when an error happens
+   * - resolves to 'true' when navigation succeeds,
+   * - resolves to 'false' when navigation fails,
+   * - is rejected when an error happens.
    *
    * ### Usage
    *
@@ -549,11 +528,11 @@ export class Router {
    * router.navigate(['team', 33, 'user', 11], {relativeTo: route});
    *
    * // Navigate without updating the URL
-   * router.navigate(['team', 33, 'user', 11], {relativeTo: route, skipLocationChange: true });
+   * router.navigate(['team', 33, 'user', 11], {relativeTo: route, skipLocationChange: true});
    * ```
    *
-   * In opposite to `navigateByUrl`, `navigate` always takes a delta
-   * that is applied to the current URL.
+   * In opposite to `navigateByUrl`, `navigate` always takes a delta that is applied to the current
+   * URL.
    */
   navigate(commands: any[], extras: NavigationExtras = {skipLocationChange: false}):
       Promise<boolean> {
@@ -563,19 +542,13 @@ export class Router {
     return this.navigateByUrl(this.createUrlTree(commands, extras), extras);
   }
 
-  /**
-   * Serializes a {@link UrlTree} into a string.
-   */
+  /** Serializes a {@link UrlTree} into a string */
   serializeUrl(url: UrlTree): string { return this.urlSerializer.serialize(url); }
 
-  /**
-   * Parses a string into a {@link UrlTree}.
-   */
+  /** Parses a string into a {@link UrlTree} */
   parseUrl(url: string): UrlTree { return this.urlSerializer.parse(url); }
 
-  /**
-   * Returns if the url is activated or not.
-   */
+  /** Returns whether the url is activated */
   isActive(url: string|UrlTree, exact: boolean): boolean {
     if (url instanceof UrlTree) {
       return containsTree(this.currentUrlTree, url, exact);
diff --git a/modules/@angular/router/src/router_state.ts b/modules/@angular/router/src/router_state.ts
index 929535d71d..3bcb7f7367 100644
--- a/modules/@angular/router/src/router_state.ts
+++ b/modules/@angular/router/src/router_state.ts
@@ -16,7 +16,6 @@ import {UrlSegment, UrlSegmentGroup, UrlTree, equalSegments} from './url_tree';
 import {merge, shallowEqual, shallowEqualArrays} from './utils/collection';
 import {Tree, TreeNode} from './utils/tree';
 
-
 /**
  * @whatItDoes Represents the state of the router.
  *
@@ -45,14 +44,10 @@ import {Tree, TreeNode} from './utils/tree';
  * @stable
  */
 export class RouterState extends Tree<ActivatedRoute> {
-  /**
-   * @internal
-   */
+  /** @internal */
   constructor(
       root: TreeNode<ActivatedRoute>,
-      /**
-       * The current snapshot of the router state.
-       */
+      /** The current snapshot of the router state */
       public snapshot: RouterStateSnapshot) {
     super(root);
     setRouterStateSnapshot<RouterState, ActivatedRoute>(this, root);
@@ -90,17 +85,18 @@ export function createEmptyStateSnapshot(
 /**
  * @whatItDoes Contains the information about a route associated with a component loaded in an
  * outlet.
- * ActivatedRoute can also be used to traverse the router state tree.
+ * An `ActivatedRoute` can also be used to traverse the router state tree.
  *
  * @howToUse
  *
  * ```
- * @Component({templateUrl:'./my-component.html'})
+ * @Component({...})
  * class MyComponent {
  *   constructor(route: ActivatedRoute) {
  *     const id: Observable<string> = route.params.map(p => p.id);
- *     const url: Observable<string> = route.url.map(s => s.join(''));
- *     const user = route.data.map(d => d.user); //includes `data` and `resolve`
+ *     const url: Observable<string> = route.url.map(segments => segments.join(''));
+ *     // route.data includes both `data` and `resolve`
+ *     const user = route.data.map(d => d.user);
  *   }
  * }
  * ```
@@ -108,112 +104,64 @@ export function createEmptyStateSnapshot(
  * @stable
  */
 export class ActivatedRoute {
+  /** The current snapshot of this route */
+  snapshot: ActivatedRouteSnapshot;
   /** @internal */
   _futureSnapshot: ActivatedRouteSnapshot;
-
-  /**
-   * The current snapshot of this route.
-   */
-  snapshot: ActivatedRouteSnapshot;
-
   /** @internal */
   _routerState: RouterState;
 
-  /**
-   * @internal
-   */
+  /** @internal */
   constructor(
-      /**
-       *  The URL segments matched by this route. The observable will emit a new value when
-       *  the array of segments changes.
-       */
+      /** An observable of the URL segments matched by this route */
       public url: Observable<UrlSegment[]>,
-
-      /**
-       * The matrix parameters scoped to this route. The observable will emit a new value when
-       * the set of the parameters changes.
-       */
+      /** An observable of the matrix parameters scoped to this route */
       public params: Observable<Params>,
-
-      /**
-       * The query parameters shared by all the routes. The observable will emit a new value when
-       * the set of the parameters changes.
-       */
+      /** An observable of the query parameters shared by all the routes */
       public queryParams: Observable<Params>,
-
-      /**
-       * The URL fragment shared by all the routes. The observable will emit a new value when
-       * the URL fragment changes.
-       */
+      /** An observable of the URL fragment shared by all the routes */
       public fragment: Observable<string>,
-
-      /**
-       * The static and resolved data of this route. The observable will emit a new value when
-       * any of the resolvers returns a new object.
-       */
+      /** An observable of the static and resolved data of this route. */
       public data: Observable<Data>,
-
-      /**
-       * The outlet name of the route. It's a constant.
-       */
+      /** The outlet name of the route. It's a constant */
       public outlet: string,
-
-      /**
-       * The component of the route. It's a constant.
-       */
-      public component: Type<any>|string,  // TODO: vsavkin: remove |string
-      futureSnapshot: ActivatedRouteSnapshot) {
+      /** The component of the route. It's a constant */
+      // TODO(vsavkin): remove |string
+      public component: Type<any>|string, futureSnapshot: ActivatedRouteSnapshot) {
     this._futureSnapshot = futureSnapshot;
   }
 
-  /**
-   * The configuration used to match this route.
-   */
+  /** The configuration used to match this route */
   get routeConfig(): Route { return this._futureSnapshot.routeConfig; }
 
-  /**
-   * The root of the router state.
-   */
+  /** The root of the router state */
   get root(): ActivatedRoute { return this._routerState.root; }
 
-  /**
-   * The parent of this route in the router state tree.
-   */
+  /** The parent of this route in the router state tree */
   get parent(): ActivatedRoute { return this._routerState.parent(this); }
 
-  /**
-   * The first child of this route in the router state tree.
-   */
+  /** The first child of this route in the router state tree */
   get firstChild(): ActivatedRoute { return this._routerState.firstChild(this); }
 
-  /**
-   * The children of this route in the router state tree.
-   */
+  /** The children of this route in the router state tree */
   get children(): ActivatedRoute[] { return this._routerState.children(this); }
 
-  /**
-   * The path from the root of the router state tree to this route.
-   */
+  /** The path from the root of the router state tree to this route */
   get pathFromRoot(): ActivatedRoute[] { return this._routerState.pathFromRoot(this); }
 
-  /**
-   * @docsNotRequired
-   */
   toString(): string {
     return this.snapshot ? this.snapshot.toString() : `Future(${this._futureSnapshot})`;
   }
 }
 
-/**
- * @internal
- */
+/** @internal */
 export type Inherited = {
-  params: Params; data: Data; resolve: Data;
+  params: Params,
+  data: Data,
+  resolve: Data,
 }
 
-/**
- * @internal
- */
+/** @internal */
 export function
 inheritedParamsDataResolve(route: ActivatedRouteSnapshot):
     Inherited {
@@ -269,59 +217,32 @@ inheritedParamsDataResolve(route: ActivatedRouteSnapshot):
 export class ActivatedRouteSnapshot {
   /** @internal **/
   _routeConfig: Route;
-
   /** @internal **/
   _urlSegment: UrlSegmentGroup;
-
   /** @internal */
   _lastPathIndex: number;
-
   /** @internal */
   _resolve: ResolveData;
-
   /** @internal */
   _resolvedData: Data;
-
   /** @internal */
   _routerState: RouterStateSnapshot;
 
-  /**
-   * @internal
-   */
+  /** @internal */
   constructor(
-      /**
-       *  The URL segments matched by this route.
-       */
+      /** The URL segments matched by this route */
       public url: UrlSegment[],
-
-      /**
-       * The matrix parameters scoped to this route.
-       */
+      /** The matrix parameters scoped to this route */
       public params: Params,
-
-      /**
-       * The query parameters shared by all the routes.
-       */
+      /** The query parameters shared by all the routes */
       public queryParams: Params,
-
-      /**
-       * The URL fragment shared by all the routes.
-       */
+      /** The URL fragment shared by all the routes */
       public fragment: string,
-
-      /**
-       * The static and resolved data of this route.
-       */
+      /** The static and resolved data of this route */
       public data: Data,
-
-      /**
-       * The outlet name of the route.
-       */
+      /** The outlet name of the route */
       public outlet: string,
-
-      /**
-       * The component of the route.
-       */
+      /** The component of the route */
       public component: Type<any>|string, routeConfig: Route, urlSegment: UrlSegmentGroup,
       lastPathIndex: number, resolve: ResolveData) {
     this._routeConfig = routeConfig;
@@ -330,41 +251,26 @@ export class ActivatedRouteSnapshot {
     this._resolve = resolve;
   }
 
-  /**
-   * The configuration used to match this route.
-   */
+  /** The configuration used to match this route */
   get routeConfig(): Route { return this._routeConfig; }
 
-  /**
-   * The root of the router state.
-   */
+  /** The root of the router state */
   get root(): ActivatedRouteSnapshot { return this._routerState.root; }
 
-  /**
-   * The parent of this route in the router state tree.
-   */
+  /** The parent of this route in the router state tree */
   get parent(): ActivatedRouteSnapshot { return this._routerState.parent(this); }
 
-  /**
-   * The first child of this route in the router state tree.
-   */
+  /** The first child of this route in the router state tree */
   get firstChild(): ActivatedRouteSnapshot { return this._routerState.firstChild(this); }
 
-  /**
-   * The children of this route in the router state tree.
-   */
+  /** The children of this route in the router state tree */
   get children(): ActivatedRouteSnapshot[] { return this._routerState.children(this); }
 
-  /**
-   * The path from the root of the router state tree to this route.
-   */
+  /** The path from the root of the router state tree to this route */
   get pathFromRoot(): ActivatedRouteSnapshot[] { return this._routerState.pathFromRoot(this); }
 
-  /**
-   * @docsNotRequired
-   */
   toString(): string {
-    const url = this.url.map(s => s.toString()).join('/');
+    const url = this.url.map(segment => segment.toString()).join('/');
     const matched = this._routeConfig ? this._routeConfig.path : '';
     return `Route(url:'${url}', path:'${matched}')`;
   }
@@ -396,11 +302,8 @@ export class ActivatedRouteSnapshot {
  * @stable
  */
 export class RouterStateSnapshot extends Tree<ActivatedRouteSnapshot> {
-  /**
-   * @internal
-   */
+  /** @internal */
   constructor(
-
       /** The url from which this snapshot was created */
       public url: string, root: TreeNode<ActivatedRouteSnapshot>) {
     super(root);
diff --git a/modules/@angular/router/src/url_tree.ts b/modules/@angular/router/src/url_tree.ts
index 0207f147b0..1adae222a9 100644
--- a/modules/@angular/router/src/url_tree.ts
+++ b/modules/@angular/router/src/url_tree.ts
@@ -17,10 +17,10 @@ export function containsTree(container: UrlTree, containee: UrlTree, exact: bool
   if (exact) {
     return equalQueryParams(container.queryParams, containee.queryParams) &&
         equalSegmentGroups(container.root, containee.root);
-  } else {
-    return containsQueryParams(container.queryParams, containee.queryParams) &&
-        containsSegmentGroup(container.root, containee.root);
   }
+
+  return containsQueryParams(container.queryParams, containee.queryParams) &&
+        containsSegmentGroup(container.root, containee.root);
 }
 
 function equalQueryParams(
@@ -83,7 +83,7 @@ function containsSegmentGroupHelper(
  * class MyComponent {
  *   constructor(router: Router) {
  *     const tree: UrlTree =
- * router.parseUrl('/team/33/(user/victor//support:help)?debug=true#fragment');
+ *       router.parseUrl('/team/33/(user/victor//support:help)?debug=true#fragment');
  *     const f = tree.fragment; // return 'fragment'
  *     const q = tree.queryParams; // returns {debug: 'true'}
  *     const g: UrlSegmentGroup = tree.root.children[PRIMARY_OUTLET];
@@ -103,79 +103,49 @@ function containsSegmentGroupHelper(
  * @stable
  */
 export class UrlTree {
-  /**
-   * @internal
-   */
+  /** @internal */
   constructor(
-      /**
-      * The root segment group of the URL tree.
-       */
+      /** The root segment group of the URL tree */
       public root: UrlSegmentGroup,
-      /**
-       * The query params of the URL.
-       */
+      /** The query params of the URL */
       public queryParams: {[key: string]: string},
-      /**
-       * The fragment of the URL.
-       */
+      /** The fragment of the URL */
       public fragment: string) {}
 
-  /**
-   * @docsNotRequired
-   */
+  /** @docsNotRequired */
   toString(): string { return new DefaultUrlSerializer().serialize(this); }
 }
 
 /**
- * @whatItDoes Represents the parsed URL segment.
+ * @whatItDoes Represents the parsed URL segment group.
  *
  * See {@link UrlTree} for more information.
  *
  * @stable
  */
 export class UrlSegmentGroup {
-  /**
-   * @internal
-   */
+  /** @internal */
   _sourceSegment: UrlSegmentGroup;
-
-  /**
-   * @internal
-   */
+  /** @internal */
   _segmentIndexShift: number;
-
-  /**
-   * The parent node in the url tree.
-   */
-  public parent: UrlSegmentGroup = null;
+  /** The parent node in the url tree */
+  parent: UrlSegmentGroup = null;
 
   constructor(
-      /**
-       * The URL segments of this group. See {@link UrlSegment} for more information.
-       */
+      /** The URL segments of this group. See {@link UrlSegment} for more information */
       public segments: UrlSegment[],
-      /**
-       * The list of children of this group.
-       */
-      public children: {[key: string]: UrlSegmentGroup}
-
-      ) {
+      /** The list of children of this group */
+      public children: {[key: string]: UrlSegmentGroup}) {
     forEach(children, (v: any, k: any) => v.parent = this);
   }
 
-  /**
-   * Return true if the segment has child segments
-   */
+  /** Wether the segment has child segments */
   hasChildren(): boolean { return this.numberOfChildren > 0; }
 
-  /**
-   * Returns the number of child sements.
-   */
+  /** Number of child segments */
   get numberOfChildren(): number { return Object.keys(this.children).length; }
 
-  /**
-   * @docsNotRequired
-   */
+  /** @docsNotRequired */
   toString(): string { return serializePaths(this); }
 }
 
@@ -200,26 +170,20 @@ export class UrlSegmentGroup {
  *
  * @description
  *
- * A UrlSegment is a part of a URL between the two slashes. It contains a path and
- * the matrix parameters associated with the segment.
+ * A UrlSegment is a part of a URL between the two slashes. It contains a path and the matrix
+ * parameters associated with the segment.
  *
  * @stable
  */
 export class UrlSegment {
   constructor(
-      /**
-       * The path part of a URL segment.
-       */
+      /** The path part of a URL segment */
       public path: string,
 
-      /**
-       * The matrix parameters associated with a segment.
-       */
-      public parameters: {[key: string]: string}) {}
+      /** The matrix parameters associated with a segment */
+      public parameters: {[name: string]: string}) {}
 
-  /**
-   * @docsNotRequired
-   */
+  /** @docsNotRequired */
   toString(): string { return serializePath(this); }
 }
 
@@ -268,14 +232,10 @@ export function mapChildrenIntoArray<T>(
  * @stable
  */
 export abstract class UrlSerializer {
-  /**
-   * Parse a url into a {@link UrlTree}.
-   */
+  /** Parse a url into a {@link UrlTree} */
   abstract parse(url: string): UrlTree;
 
-  /**
-   * Converts a {@link UrlTree} into a url.
-   */
+  /** Converts a {@link UrlTree} into a url */
   abstract serialize(tree: UrlTree): string;
 }
 
@@ -298,17 +258,13 @@ export abstract class UrlSerializer {
  * @stable
  */
 export class DefaultUrlSerializer implements UrlSerializer {
-  /**
-   * Parse a url into a {@link UrlTree}.
-   */
+  /** Parses a url into a {@link UrlTree} */
   parse(url: string): UrlTree {
     const p = new UrlParser(url);
     return new UrlTree(p.parseRootSegment(), p.parseQueryParams(), p.parseFragment());
   }
 
-  /**
-   * Converts a {@link UrlTree} into a url.
-   */
+  /** Converts a {@link UrlTree} into a url */
   serialize(tree: UrlTree): string {
     const segment = `/${serializeSegment(tree.root, true)}`;
     const query = serializeQueryParams(tree.queryParams);
@@ -383,6 +339,7 @@ function serializeQueryParams(params: {[key: string]: any}): string {
 class Pair<A, B> {
   constructor(public first: A, public second: B) {}
 }
+
 function pairs<T>(obj: {[key: string]: T}): Pair<string, T>[] {
   const res: Pair<string, T>[] = [];
   for (const prop in obj) {
@@ -436,9 +393,9 @@ class UrlParser {
 
     if (this.remaining === '' || this.remaining.startsWith('?') || this.remaining.startsWith('#')) {
       return new UrlSegmentGroup([], {});
-    } else {
-      return new UrlSegmentGroup([], this.parseChildren());
     }
+
+    return new UrlSegmentGroup([], this.parseChildren());
   }
 
   parseChildren(): {[key: string]: UrlSegmentGroup} {
@@ -508,9 +465,9 @@ class UrlParser {
   parseFragment(): string {
     if (this.peekStartsWith('#')) {
       return decodeURI(this.remaining.substring(1));
-    } else {
-      return null;
     }
+
+    return null;
   }
 
   parseMatrixParams(): {[key: string]: any} {
diff --git a/modules/@angular/router/src/utils/collection.ts b/modules/@angular/router/src/utils/collection.ts
index 5ed30e710f..5046aefd71 100644
--- a/modules/@angular/router/src/utils/collection.ts
+++ b/modules/@angular/router/src/utils/collection.ts
@@ -60,7 +60,7 @@ export function last<T>(a: T[]): T {
 }
 
 export function and(bools: boolean[]): boolean {
-  return bools.reduce((a, b) => a && b, true);
+  return !bools.some(v => !v);
 }
 
 export function merge<V>(m1: {[key: string]: V}, m2: {[key: string]: V}): {[key: string]: V} {
@@ -81,8 +81,7 @@ export function merge<V>(m1: {[key: string]: V}, m2: {[key: string]: V}): {[key:
   return m;
 }
 
-export function forEach<K, V>(
-    map: {[key: string]: V}, callback: /*(V, K) => void*/ Function): void {
+export function forEach<K, V>(map: {[key: string]: V}, callback: (v: V, k: string) => void): void {
   for (const prop in map) {
     if (map.hasOwnProperty(prop)) {
       callback(map[prop], prop);
@@ -117,9 +116,9 @@ export function waitForMap<A, B>(
     const concatted$ = concatAll.call(of (...waitFor));
     const last$ = l.last.call(concatted$);
     return map.call(last$, () => res);
-  } else {
-    return of (res);
   }
+
+  return of (res);
 }
 
 export function andObservables(observables: Observable<Observable<any>>): Observable<boolean> {
@@ -130,9 +129,11 @@ export function andObservables(observables: Observable<Observable<any>>): Observ
 export function wrapIntoObservable<T>(value: T | Promise<T>| Observable<T>): Observable<T> {
   if (value instanceof Observable) {
     return value;
-  } else if (value instanceof Promise) {
-    return fromPromise(value);
-  } else {
-    return of (value);
   }
+
+  if (value instanceof Promise) {
+    return fromPromise(value);
+  }
+
+  return of (value);
 }
\ No newline at end of file
diff --git a/tools/public_api_guard/router/index.d.ts b/tools/public_api_guard/router/index.d.ts
index d692a8df74..eb5a2ce1d7 100644
--- a/tools/public_api_guard/router/index.d.ts
+++ b/tools/public_api_guard/router/index.d.ts
@@ -366,13 +366,13 @@ export declare abstract class UrlHandlingStrategy {
 /** @stable */
 export declare class UrlSegment {
     parameters: {
-        [key: string]: string;
+        [name: string]: string;
     };
     path: string;
     constructor(
         path: string,
         parameters: {
-        [key: string]: string;
+        [name: string]: string;
     });
     toString(): string;
 }