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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | 10x 10x 10x 21x 18x 10x 10x 21x 46x 43x 3x | import { _reduceLazy, LazyResult } from './_reduceLazy';
import { purry } from './purry';
type Flatten<T> = T extends ReadonlyArray<infer K> ? K : T;
/**
* Flattens `array` a single level deep.
* Note: In `pipe`, use `flatten()` form instead of `flatten`. Otherwise, the inferred type is lost.
* @param items the target array
* @signature P.flatten(array)
* @example
* P.flatten([[1, 2], [3], [4, 5]]) // => [1, 2, 3, 4, 5]
* P.pipe(
* [[1, 2], [3], [4, 5]],
* P.flatten(),
* ); // => [1, 2, 3, 4, 5]
* @category Array
* @pipeable
*/
export function flatten<T>(items: readonly T[]): Array<Flatten<T>>;
export function flatten<T>(): (items: readonly T[]) => Array<Flatten<T>>;
export function flatten() {
return purry(_flatten, arguments, flatten.lazy);
}
function _flatten<T>(items: T[]): Array<Flatten<T>> {
return _reduceLazy(items, flatten.lazy());
}
export namespace flatten {
export function lazy<T>() {
return (next: T): LazyResult<any> => {
if (Array.isArray(next)) {
return {
done: false,
hasNext: true,
hasMany: true,
next: next,
};
}
return {
done: false,
hasNext: true,
next,
};
};
}
}
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