concat$

Combines values from sets.

Alternatives: [concat], [concat$].

set.concat$(x, ...ys);
// x:  a set (updated)
// ys: other sets
// --> x

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

var x = new Set([1, 2]);
var y = new Set([3, 4]);
set.concat$(x, y);
// Set(4) { 1, 2, 3, 4 }

x;
// Set(4) { 1, 2, 3, 4 }

var x = new Set([1, 2]);
var z = new Set([40, 50]);
set.concat$(x, y, z);
// Set(6) { 1, 2, 3, 4, 40, 50 }

references

• Array.prototype.concat: MDN web docs
• Array.add: sugarjs