angular-docs-cn/public/docs/dart/latest/guide/pipes.jade

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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)).