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API / @angular/core

IterableDiffer

A strategy for tracking changes over time to an iterable. Used by NgForOfto respond to changes in an iterable by effecting equivalent changes in the DOM.

interface IterableDiffer<V> { diff(object: NgIterable<V>): IterableChanges<V> | null }

实现类

方法

diff()

Compute a difference between the previous state and the new object state.

diff(object: NgIterable<V>): IterableChanges<V> | null

参数

object

containing the new value.

返回值

IterableChanges<V> | null: an object describing the difference. The return value is only valid until the next diff() invocation.