dependency-cruiser/src/utl/array-util.mjs

Validate and visualize dependencies. With your rules. JavaScript, TypeScript, CoffeeScript. ES6, CommonJS, AMD.

/**
 * returns true if there's at least one element in pLeftArray that's also
 * in pRightArray
 *
 * @param {string[]} pLeftArray an array of strings
 * @param {string[]} pRightArray another array of strings
 * @return {boolean} true if there's at least one element in pLeftArray also in pRightArray
 */
export function intersects(pLeftArray, pRightArray) {
	if (pLeftArray.length === 0 || pRightArray.length === 0) {
		return false;
	}
	if (pRightArray.length < pLeftArray.length) {
		return pRightArray.some((pItem) => pLeftArray.includes(pItem));
	}
	return pLeftArray.some((pItem) => pRightArray.includes(pItem));
}

export function uniq(pArray) {
	return [...new Set(pArray)];
}

/**
 * @param {any[]} pArray
 * @param {function} pIteratee
 * @returns {any[]}
 */
export function uniqBy(pArray, pIteratee) {
	const lSeen = new Map();
	const lResult = [];

	for (const lElement of pArray) {
		const lKey = pIteratee(lElement);
		if (!lSeen.has(lKey)) {
			lSeen.set(lKey, true);
			lResult.push(lElement);
		}
	}

	return lResult;
}

/**
 * @param {any[]} pArray
 * @param {function} pComparator
 * @returns {any[]}
 */
export function uniqWith(pArray, pComparator) {
	const lResult = [];

	for (const lElement of pArray) {
		if (!lResult.some((pY) => pComparator(lElement, pY))) {
			lResult.push(lElement);
		}
	}

	return lResult;
}