import { reduce } from './reduce';
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import { OperatorFunction } from '../types';
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import { operate } from '../util/lift';
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const arrReducer = (arr: any[], value: any) => (arr.push(value), arr);
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/**
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* Collects all source emissions and emits them as an array when the source completes.
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*
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* <span class="informal">Get all values inside an array when the source completes</span>
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*
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* 
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*
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* `toArray` will wait until the source Observable completes before emitting
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* the array containing all emissions. When the source Observable errors no
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* array will be emitted.
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*
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* ## Example
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*
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* ```ts
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* import { interval, take, toArray } from 'rxjs';
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*
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* const source = interval(1000);
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* const example = source.pipe(
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* take(10),
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* toArray()
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* );
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*
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* example.subscribe(value => console.log(value));
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*
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* // output: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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* ```
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*
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* @return A function that returns an Observable that emits an array of items
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* emitted by the source Observable when source completes.
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*/
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export function toArray<T>(): OperatorFunction<T, T[]> {
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// Because arrays are mutable, and we're mutating the array in this
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// reducer process, we have to encapsulate the creation of the initial
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// array within this `operate` function.
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return operate((source, subscriber) => {
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reduce(arrReducer, [] as T[])(source).subscribe(subscriber);
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});
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}
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