es-toolkit/dist/fp/array/dropWhile.js

A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.

const require_dropWhile = require("../../array/dropWhile.js");
const require_lazy = require("../_internal/lazy.js");
//#region src/fp/array/dropWhile.ts
/**
* Creates a function that removes leading values while a predicate returns true.
*
* Once the predicate returns false, that value and all following values are
* emitted. The returned function is lazy-capable inside {@link pipe}.
*
* @template T - The type of elements in the array.
* @param predicate - Called with each leading value and index while values are being dropped.
* @returns A function that maps the piped array to the remaining suffix.
*
* @example
* import { dropWhile, pipe } from 'es-toolkit/fp';
*
* pipe([1, 2, 3, 1], dropWhile(value => value < 3));
* // => [3, 1]
*/
function dropWhile(predicate) {
	function dropWhileEager(array) {
		return require_dropWhile.dropWhile(array, (item, index) => predicate(item, index));
	}
	const dropWhileLazy = (emit) => {
		let dropping = true;
		let index = 0;
		return (value) => {
			if (dropping && predicate(value, index++)) return true;
			dropping = false;
			return emit(value);
		};
	};
	return require_lazy.combineEagerAndLazyFunctions(dropWhileEager, dropWhileLazy);
}
//#endregion
exports.dropWhile = dropWhile;