@extra-array/union-on-update

Gives values present in any array. 🏃 📼 📦 🌔

Alternatives: compare, compare-update, map, map-update.
This is part of package extra-array.

array.unionOn$(x, y, [fn], [ths]);
// x:   an array (updated)
// y:   another array
// fn:  map function (v, i, x)
// ths: this argument
// --> x

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

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

x;
// [1, 2, 3, 4, 5]

var x = [1, 2, 3, 4];
array.unionOn$(x, [-2, -3, -5], v => Math.abs(v));
// [1, 2, 3, 4, -5]

references

• Data.Set.union: Haskell
• _.union: lodash
• Set.union: Python