zip

Combines entries from objects. 🏃 📼 📦 🌔 📒

Similar: cartesianProduct, zip.

object.zip(xs, [fm], [ft], [vd]);
// xs: objects
// fm: map function (vs, k, null)
// ft: till function (dones) (some)
// vd: default value

const map = require('extra-map');
const array = require('extra-array');

var x = new Map([['a', 1], ['b', 2], ['c', 3]]);
var y = new Map([['a', 10], ['b', 20]]);
map.zip([x, y]);
// { a: [ 1, 10 ], b: [ 2, 20 ] } (shortest)

map.zip([x, y], ([a, b]) => a + b);
// { a: 11, b: 22 }

map.zip([x, y], null, array.some);
// { a: [ 1, 10 ], b: [ 2, 20 ] } (shortest)

map.zip([x, y], null, array.every, 0);
// { a: [ 1, 10 ], b: [ 2, 20 ], c: [ 3, 0 ] } (longest)

map.zip([x, y], null, array.head, 0);
// { a: [ 1, 10 ], b: [ 2, 20 ], c: [ 3, 0 ] } (first)

references

• Data.List.zipWith: Haskell
• List-Extra.zip: elm
• zip: Python
• itertools.zip_longest: Python
• zip: Ruby
• _.zip: lodash
• _.zipWith: lodash
• Array.zip: sugarjs