froebel/zip.js

TypeScript utility library

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.zipWith = exports.default = void 0;

/**
 * Takes multiple lists and returns a list of tuples containing the value in
 * each list at the current index. If the lists are of different lengths, the
 * returned list of tuples has the length of the shortest passed in list.
 *
 * @example
 * ```
 * const pairs = zip([1,2,3], ['a','b','c'])
 * console.log(pairs) // prints: [[1,'a'], [2,'b'], [3,'c']]
 * ```
 */
const zip = (...lists) => [...Array(Math.min(...lists.map(({
  length
}) => length)))].map((_, i) => lists.map(l => l[i]));

var _default = zip;
/**
 * Same as {@link zip} but also takes a `zipper` function, that is called for
 * each index with the element at current index in each list as arguments. The
 * result of `zipper` is the element at current index in the list returned from
 * `zipWith`.
 *
 * @example
 * ```
 * const sums = zipWith((a,b) => a+b, [1,2,3], [4,5,6])
 * console.log(sums) // prints: [5,7,9]
 * ```
 */

exports.default = _default;

const zipWith = (zipper, ...lists) => [...Array(Math.min(...lists.map(({
  length
}) => length)))].map((_, i) => zipper(...lists.map(l => l[i])));

exports.zipWith = zipWith;
module.exports = Object.assign(exports.default || {}, exports);