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/Angular 12

KeyValueChanges

interface

An object describing the changes in the Map or {[k:string]: string} since last time KeyValueDiffer#diff() was invoked.

interface KeyValueChanges<K, V> {
  forEachItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void
  forEachPreviousItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void
  forEachChangedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void
  forEachAddedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void
  forEachRemovedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void
}

Methods

forEachItem()

Iterate over all changes. KeyValueChangeRecord will contain information about changes to each item.

forEachItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void

Parameters
fn (r: KeyValueChangeRecord) => void
Returns

void
forEachPreviousItem()

Iterate over changes in the order of original Map showing where the original items have moved.

forEachPreviousItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void

Parameters
fn (r: KeyValueChangeRecord) => void
Returns

void
forEachChangedItem()

Iterate over all keys for which values have changed.

forEachChangedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void

Parameters
fn (r: KeyValueChangeRecord) => void
Returns

void
forEachAddedItem()

Iterate over all added items.

forEachAddedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void

Parameters
fn (r: KeyValueChangeRecord) => void
Returns

void
forEachRemovedItem()

Iterate over all removed items.

forEachRemovedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void

Parameters
fn (r: KeyValueChangeRecord) => void
Returns

void

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https://v12.angular.io/api/core/KeyValueChanges