union$ (original) (raw)
Obtain values present in any array!
Alternatives: union, union$.
Similar: union, intersection, difference, symmetricDifference.
function union$(x, y, fc, fm) // x: an array (updated!) // y: another array // fc: compare function (a, b) // fm: map function (v, i, x)
⏱️ Compare function ⇒ O(n²).
const xarray = require('extra-array');
var x = [1, 2, 3, 4]; var y = [2, 3, 5]; xarray.union$(x, y); // → [ 1, 2, 3, 4, 5 ]
x; // → [ 1, 2, 3, 4, 5 ]
var x = [1, 2, 3, 4]; var y = [-2, -3, -5]; xarray.union$(x, y, (a, b) => Math.abs(a) - Math.abs(b)); // → [ 1, 2, 3, 4, -5 ]
var x = [1, 2, 3, 4]; xarray.union$(x, y, null, v => Math.abs(v)); // → [ 1, 2, 3, 4, -5 ]