Patrice Chalin ad95b04e69 docs(dev guide): pipes - new Dart prose, update Dart and Ts code (#1353)
+ guide/pipes/ts: update docs and example code

+ guide/pipes/dart: new prose, updated example code

+ fix platform_directives reference; html cleanup

+ enable pipes e2e testing
For `e2e-spec.js`: If the async test is executed too early it will fail
(simply because the async message hasn’t been received yet).

+ follow new constants naming convention
2016-05-13 21:44:14 +01:00

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extends ../../../ts/latest/guide/pipes.jade
block includes
include ../_util-fns
block pure-change
:marked
Angular executes a *pure pipe* only when it detects a *pure change* to the input value.
In Angular Dart, a *pure change* results only from a change in object reference
(given that [everything is an object in Dart](https://www.dartlang.org/docs/dart-up-and-running/ch02.html#important-concepts)).