bind(), call(), and apply()

const arr = ['a', 'b', 'c'];
const numbers = [1, 2, 3];

Array.prototype.push.apply(arr, numbers);
console.log(arr);

Creates a new array
Concatenates arrays using method borrowing
This demonstrates array method borrowing with apply(): 1) Uses push method to add elements from one array to another, 2) apply() spreads the numbers array as individual arguments, 3) Modifies the original arr in place, 4) Alternative to arr.push(...numbers), 5) Historical pattern before spread operator, 6) Shows how built-in methods can be borrowed and reused.
Copies array references
Sorts the arrays