31 lines
1.1 KiB
JavaScript
31 lines
1.1 KiB
JavaScript
import { takeWhile as takeWhile$1 } from "../../array/takeWhile.mjs";
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import { combineEagerAndLazyFunctions, createLazyFunction } from "../_internal/lazy.mjs";
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//#region src/fp/array/takeWhile.ts
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/**
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* Creates a function that takes leading values while a predicate returns true.
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*
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* The returned function is lazy-capable and short-circuiting inside
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* {@link pipe}; once the predicate returns false, upstream lazy operators stop
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* processing further input.
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*
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* @template T - The type of elements in the array.
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* @param predicate - Called with each value and index until it returns false.
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* @returns A function that maps the piped array to the matching prefix.
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*
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* @example
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* import { pipe, takeWhile } from 'es-toolkit/fp';
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*
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* pipe([1, 2, 3, 1], takeWhile(value => value < 3));
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* // => [1, 2]
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*/
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function takeWhile(predicate) {
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function takeWhileEager(array) {
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return takeWhile$1(array, (element, index) => predicate(element, index));
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}
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return combineEagerAndLazyFunctions(takeWhileEager, createLazyFunction((value, index, emit) => {
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if (!predicate(value, index)) return false;
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emit(value);
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}), { shortCircuit: true });
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}
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//#endregion
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export { takeWhile };
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