package.lib.util.IterableHelpers.js Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of webpack Show documentation

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

The newest version!

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

/**
 * @template T
 * @param {Iterable} set a set
 * @returns {T | undefined} last item
 */
const last = set => {
	let last;
	for (const item of set) last = item;
	return last;
};

/**
 * @template T
 * @param {Iterable} iterable iterable
 * @param {function(T): boolean} filter predicate
 * @returns {boolean} true, if some items match the filter predicate
 */
const someInIterable = (iterable, filter) => {
	for (const item of iterable) {
		if (filter(item)) return true;
	}
	return false;
};

/**
 * @template T
 * @param {Iterable} iterable an iterable
 * @returns {number} count of items
 */
const countIterable = iterable => {
	let i = 0;
	// eslint-disable-next-line no-unused-vars
	for (const _ of iterable) i++;
	return i;
};

exports.last = last;
exports.someInIterable = someInIterable;
exports.countIterable = countIterable;