zip

Combines matching entries from all lists. 🏃 📼 📦 🌔 📒

Similar: cartesianProduct, zip.

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

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

var x = [['a', 'b', 'c'], [1, 2, 3]];
var y = [['a', 'b'], [10, 20]];
lists.zip([x, y]).map(c => [...c]);
// [ [ 'a', 'b' ], [ [ 1, 10 ], [ 2, 20 ] ] ] (shortest)

lists.zip([x, y], ([a, b]) => a + b).map(c => [...c]);
// [ [ 'a', 'b' ], [ 11, 22 ] ]

lists.zip([x, y], null, array.some).map(c => [...c]);
// [ [ 'a', 'b' ], [ [ 1, 10 ], [ 2, 20 ] ] ] (shortest)

lists.zip([x, y], null, array.every, 0).map(c => [...c]);
// [ [ 'a', 'b', 'c' ], [ [ 1, 10 ], [ 2, 20 ], [ 3, 0 ] ] ] (longest)

references

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