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