intersection

Gives values present in both iterables.

Alternatives: compare, map.

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

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

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

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

references

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