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import { Pred, PredIndexedOptional, PredIndexed } from './_types';
import { _toLazyIndexed } from './_toLazyIndexed';
import { _toSingle } from './_toSingle';
/**
* Returns the value of the first element in the array where predicate is true, and undefined otherwise.
* @param items the array
* @param fn the predicate
* @signature
* P.find(items, fn)
* @signature
* P.find(fn)(items)
* @example
* P.find([1, 3, 4, 6], n => n % 2 === 0) // => 4
* P.pipe(
* [1, 3, 4, 6],
* P.find(n => n % 2 === 0)
* ) // => 4
* P.pipe(
* [1, 3, 4, 6],
* P.find.indexed((n, i) => n % 2 === 0)
* ) // => 4
* @category Array, Pipe
*/
export function find<T>(
array: readonly T[],
fn: Pred<T, boolean>
): T | undefined;
export function find<T = never>(
fn: Pred<T, boolean>
): (array: readonly T[]) => T | undefined;
export function find() {
return purry(_find(false), arguments, find.lazy);
}
const _find = (indexed: boolean) => <T>(
array: T[],
fn: PredIndexedOptional<T, boolean>
) => {
if (indexed) {
return array.find(fn);
}
return array.find(x => fn(x));
};
const _lazy = (indexed: boolean) => <T>(
fn: PredIndexedOptional<T, boolean>
) => {
return (value: T, index?: number, array?: T[]) => {
const valid = indexed ? fn(value, index, array) : fn(value);
return {
done: valid,
hasNext: valid,
next: value,
};
};
};
export namespace find {
export function indexed<T>(
array: readonly T[],
fn: PredIndexed<T, boolean>
): T | undefined;
export function indexed<T>(
fn: PredIndexed<T, boolean>
): (array: readonly T[]) => T | undefined;
export function indexed() {
return purry(_find(true), arguments, find.lazyIndexed);
}
export const lazy = _toSingle(_lazy(false));
export const lazyIndexed = _toSingle(_toLazyIndexed(_lazy(true)));
}
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