IterableDiffer — Angular

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

API

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

diff

IterableChanges<V> | null

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

@paramobjectNgIterable<V> | null | undefined

containing the new value.

@returnsIterableChanges<V> | null

an object describing the difference. The return value is only valid until the next diff() invocation.