zip - nodef/extra-array GitHub Wiki

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