Function iterableDifferToString

packages/core/test/change_detection/util.ts:20–59

(iterableChanges: IterableChanges<V>)

import {stringify} from '../../src/util/stringify';

export function iterableDifferToString<V>(iterableChanges: IterableChanges<V>) {
  const collection: string[] = [];
  iterableChanges.forEachItem((record: IterableChangeRecord<V>) =>
    collection.push(icrAsString(record)),
  );

  const previous: string[] = [];
  iterableChanges.forEachPreviousItem((record: IterableChangeRecord<V>) =>
    previous.push(icrAsString(record)),
  );

  const additions: string[] = [];
  iterableChanges.forEachAddedItem((record: IterableChangeRecord<V>) =>
    additions.push(icrAsString(record)),
  );

  const moves: string[] = [];
  iterableChanges.forEachMovedItem((record: IterableChangeRecord<V>) =>
    moves.push(icrAsString(record)),
  );

  const removals: string[] = [];
  iterableChanges.forEachRemovedItem((record: IterableChangeRecord<V>) =>
    removals.push(icrAsString(record)),
  );

  const identityChanges: string[] = [];
  iterableChanges.forEachIdentityChange((record: IterableChangeRecord<V>) =>
    identityChanges.push(icrAsString(record)),
  );

  return iterableChangesAsString({
    collection,
    previous,
    additions,
    moves,
    removals,
    identityChanges,
  });
}

function icrAsString<V>(icr: IterableChangeRecord<V>): string {
  return icr.previousIndex === icr.currentIndex