47 lines
1.8 KiB
JavaScript
47 lines
1.8 KiB
JavaScript
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/** PURE_IMPORTS_START .._operators_distinctUntilChanged PURE_IMPORTS_END */
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import { distinctUntilChanged as higherOrder } from '../operators/distinctUntilChanged';
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/* tslint:enable:max-line-length */
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/**
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* Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item.
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*
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* If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted.
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*
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* If a comparator function is not provided, an equality check is used by default.
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*
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* @example <caption>A simple example with numbers</caption>
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* Observable.of(1, 1, 2, 2, 2, 1, 1, 2, 3, 3, 4)
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* .distinctUntilChanged()
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* .subscribe(x => console.log(x)); // 1, 2, 1, 2, 3, 4
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*
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* @example <caption>An example using a compare function</caption>
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* interface Person {
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* age: number,
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* name: string
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* }
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*
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* Observable.of<Person>(
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* { age: 4, name: 'Foo'},
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* { age: 7, name: 'Bar'},
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* { age: 5, name: 'Foo'})
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* { age: 6, name: 'Foo'})
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* .distinctUntilChanged((p: Person, q: Person) => p.name === q.name)
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* .subscribe(x => console.log(x));
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*
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* // displays:
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* // { age: 4, name: 'Foo' }
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* // { age: 7, name: 'Bar' }
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* // { age: 5, name: 'Foo' }
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*
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* @see {@link distinct}
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* @see {@link distinctUntilKeyChanged}
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*
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* @param {function} [compare] Optional comparison function called to test if an item is distinct from the previous item in the source.
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* @return {Observable} An Observable that emits items from the source Observable with distinct values.
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* @method distinctUntilChanged
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* @owner Observable
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*/
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export function distinctUntilChanged(compare, keySelector) {
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return higherOrder(compare, keySelector)(this);
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}
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//# sourceMappingURL=distinctUntilChanged.js.map
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