concat

Appends arrays to the end.

Alternatives: default, update.

array.concat(x, ...ys);
// x:  an array
// ys: arrays to append

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

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

var y = [5, 6];
array.concat(x, y, y);
// [
//   1, 2,
//   5, 6, 5, 6
// ]

references

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