difference - nodef/extra-array GitHub Wiki

Obtain values not present in another array.

Similar: union, intersection, difference, symmetricDifference.

function difference(x, y, fc, fm)
// x:  an array
// 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, 5];
var y = [2, 4];
xarray.difference(x, y);
// → [ 1, 3, 5 ]

var y = [-2, -4];
xarray.difference(x, y);
// → [ 1, 2, 3, 4, 5 ]

xarray.difference(x, y, (a, b) => Math.abs(a) - Math.abs(b));
// → [ 1, 3, 5 ]

xarray.difference(x, y, null, v => Math.abs(v));
// → [ 1, 3, 5 ]

References