cartesianProduct

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Subhajit Sahu edited this page Dec 8, 2022 · 13 revisions

List cartesian product of objects.

Similar: cartesianProduct, zip.

function cartesianProduct(xs, fm)
// xs: objects
// fm: map function (vs)

const object = require('extra-object');

var x = {a: 1, b: 2, c: 3};
var y = {d: 10, e: 20};
[...object.cartesianProduct([x, y])];
// → [
// →   { a: 1, d: 10 },
// →   { a: 1, e: 20 },
// →   { b: 2, d: 10 },
// →   { b: 2, e: 20 },
// →   { c: 3, d: 10 },
// →   { c: 3, e: 20 }
// → ]

[...object.cartesianProduct([x, y], a => object.max(a))];
// → [ 10, 20, 10, 20, 10, 20 ]

References