A rest parameter allows a function to accept an indefinite number of arguments as an array. It is denoted by the ‘…’ syntax and indicates that the function can accept one or more arguments.
function add(...values: number[]) {
let sum = 0;
values.forEach(val => sum += val);
return sum;
}
const sum = add(5, 10, 15, 20);
console.log(sum); // 50
In contrast, the rest arguments allow a function caller to provide a variable number of arguments from an array. Consider the following example.
const first = [1, 2, 3];
const second = [4, 5, 6];
first.push(...second);
console.log(first); // [1, 2, 3, 4, 5, 6]
