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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 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | 12x 12x 12x 12x 23x 27x 4x 24x 27x 85x 85x 64x 21x 12x 12x 4x 12x 12x | import { purry } from './purry';
import { _reduceLazy, LazyResult } from './_reduceLazy';
import { Pred, PredIndexedOptional, PredIndexed } from './_types';
import { _toLazyIndexed } from './_toLazyIndexed';
/**
* Filter the elements of an array that meet the condition specified in a callback function.
* @param array The array to filter.
* @param fn the callback function.
* @signature
* P.filter(array, fn)
* @signature
* P.filter(fn)(array)
* @example
* P.filter([1, 2, 3], x => x % 2 === 1) // => [1, 3]
*
* P.pipe([1, 2, 3], P.filter(x => x % 2 === 1)) // => [1, 3]
* @category Array, Pipe
*/
export function filter<T, S extends T>(
array: readonly T[],
fn: (value: T) => value is S
): S[];
export function filter<T>(array: readonly T[], fn: Pred<T, boolean>): T[];
export function filter<T, S extends T>(
fn: (input: T) => input is S
): (array: readonly T[]) => S[];
export function filter<T>(fn: Pred<T, boolean>): (array: readonly T[]) => T[];
export function filter() {
return purry(_filter(false), arguments, filter.lazy);
}
const _filter = (indexed: boolean) => <T>(
array: T[],
fn: PredIndexedOptional<T, boolean>
) => {
return _reduceLazy(
array,
indexed ? filter.lazyIndexed(fn) : filter.lazy(fn),
indexed
);
};
const _lazy = (indexed: boolean) => <T>(
fn: PredIndexedOptional<T, boolean>
) => {
return (value: T, index?: number, array?: readonly T[]): LazyResult<T> => {
const valid = indexed ? fn(value, index, array) : fn(value);
if (!!valid === true) {
return {
done: false,
hasNext: true,
next: value,
};
}
return {
done: false,
hasNext: false,
};
};
};
export namespace filter {
export function indexed<T, S extends T>(
array: readonly T[],
fn: (input: T, index: number, array: readonly T[]) => input is S
): S[];
export function indexed<T>(
array: readonly T[],
fn: PredIndexed<T, boolean>
): T[];
/**
* @data_last
*/
export function indexed<T, S extends T>(
fn: (input: T, index: number, array: readonly T[]) => input is S
): (array: readonly T[]) => S[];
export function indexed<T>(
fn: PredIndexed<T, boolean>
): (array: readonly T[]) => T[];
export function indexed() {
return purry(_filter(true), arguments, filter.lazyIndexed);
}
export const lazy = _lazy(false);
export const lazyIndexed = _toLazyIndexed(_lazy(true));
}
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