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51 lines
2.4 KiB
51 lines
2.4 KiB
import { Observable } from '../Observable'; |
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import { UnaryFunction } from '../types'; |
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/** |
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* Splits the source Observable into two, one with values that satisfy a |
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* predicate, and another with values that don't satisfy the predicate. |
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* |
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* <span class="informal">It's like {@link filter}, but returns two Observables: |
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* one like the output of {@link filter}, and the other with values that did not |
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* pass the condition.</span> |
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* |
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*  |
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* |
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* `partition` outputs an array with two Observables that partition the values |
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* from the source Observable through the given `predicate` function. The first |
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* Observable in that array emits source values for which the predicate argument |
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* returns true. The second Observable emits source values for which the |
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* predicate returns false. The first behaves like {@link filter} and the second |
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* behaves like {@link filter} with the predicate negated. |
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* |
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* ## Example |
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* Partition click events into those on DIV elements and those elsewhere |
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* ```ts |
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* import { fromEvent } from 'rxjs'; |
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* import { partition } from 'rxjs/operators'; |
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* |
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* const clicks = fromEvent(document, 'click'); |
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* const parts = clicks.pipe(partition(ev => ev.target.tagName === 'DIV')); |
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* const clicksOnDivs = parts[0]; |
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* const clicksElsewhere = parts[1]; |
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* clicksOnDivs.subscribe(x => console.log('DIV clicked: ', x)); |
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* clicksElsewhere.subscribe(x => console.log('Other clicked: ', x)); |
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* ``` |
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* |
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* @see {@link filter} |
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* |
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* @param {function(value: T, index: number): boolean} predicate A function that |
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* evaluates each value emitted by the source Observable. If it returns `true`, |
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* the value is emitted on the first Observable in the returned array, if |
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* `false` the value is emitted on the second Observable in the array. The |
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* `index` parameter is the number `i` for the i-th source emission that has |
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* happened since the subscription, starting from the number `0`. |
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* @param {any} [thisArg] An optional argument to determine the value of `this` |
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* in the `predicate` function. |
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* @return {[Observable<T>, Observable<T>]} An array with two Observables: one |
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* with values that passed the predicate, and another with values that did not |
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* pass the predicate. |
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* @method partition |
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* @owner Observable |
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* @deprecated use `partition` static creation function instead |
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*/ |
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export declare function partition<T>(predicate: (value: T, index: number) => boolean, thisArg?: any): UnaryFunction<Observable<T>, [Observable<T>, Observable<T>]>;
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