intersection

Gives values present in both arrays. 🏃 📼 📦 🌔

Alternatives: compare, map.

array.intersection(x, y, [fn]);
// x:  an array
// y:  another array
// fn: compare function (a, b)

⏱️ Compare function => O(n²).

const array = require('extra-array');

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

var y = [-2, -3, -5];
array.intersection(x, y, (a, b) => Math.abs(a) - Math.abs(b));
// [ 2, 3 ]

array.intersection(x, y, null, v => Math.abs(v));
// [ 2, 3 ]

references

• Data.Set.intersection: Haskell
• Set.intersection: Python