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> | nullCompute a difference between the previous state and the new object state.
@returns
IterableChanges<V> | null