union$ - nodef/extra-array GitHub Wiki
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 ]