concat

Appends iterables to the end.

iterable.concat(...xs);
// xs: iterables

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

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

[...iterable.concat(x, y, y)];
// [
//   1, 2,
//   3, 4, 3, 4
// ]

references

• Array.prototype.concat(): MDN web docs