zip (original) (raw)

Combine values from arrays.

Similar: cartesianProduct, zip.

function zip(xs, fm, fe, vd?) // xs: arrays // fm: map function (vs, i) // fe: end function (dones) [some] // vd: default value

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

var x = [1, 2, 3]; var y = [4, 5]; xarray.zip([x, y]); // → [ [ 1, 4 ], [ 2, 5 ] ] (shortest)

xarray.zip([x, y], ([a, b]) => a + b); // → [ 5, 7 ]

xarray.zip([x, y], null, xarray.some); // → [ [ 1, 4 ], [ 2, 5 ] ] (shortest)

xarray.zip([x, y], null, xarray.every, 0); // → [ [ 1, 4 ], [ 2, 5 ], [ 3, 0 ] ] (longest)

xarray.zip([x, y], null, xarray.head, 0); // → [ [ 1, 4 ], [ 2, 5 ], [ 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() : Sugar.js
• std::inner_product() : cppreference.com