difference

Gives values of array not present in another. 🏃 📼 📦 🌔 📒

Similar: union, intersection, difference, symmetricDifference.

array.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 array = require("extra-array");

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

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

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

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

References

• Data.List.\: Haskell
• Data.Set.difference: Haskell
• Set.difference: Python
• _.difference: lodash
• _.differenceBy: lodash
• _.differenceWith: lodash
• Array.remove: sugarjs