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difference
Subhajit Sahu edited this page May 3, 2023
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27 revisions
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 ]