cartesianProduct

Obtain cartesian product of arrays.

Similar: cartesianProduct, zip.

function cartesianProduct(xs, fm)
// xs: arrays
// fm: map function (vs, i)

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

var x = [1, 2, 3];
var y = [10, 20, 30];
xarray.cartesianProduct([x, y]);
// → [
//   [ 1, 10 ], [ 1, 20 ],
//   [ 1, 30 ], [ 2, 10 ],
//   [ 2, 20 ], [ 2, 30 ],
//   [ 3, 10 ], [ 3, 20 ],
//   [ 3, 30 ]
// ]

xarray.cartesianProduct([x, y], ([a, b]) => a + b);
// → [
//   11, 21, 31, 12, 22,
//   32, 13, 23, 33
// ]

References

• Data.Set.cartesianProduct() : Haskell
• List-Extra.cartesianProduct() : Elm
• itertools.product() : Python
• Guava.Lists: Java
• fast-cartesian-product : @fisker
• cartesian-product : @izaakschroeder
• cartesian : @alexindigo