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JS Functions

The Rest Parameter

The rest parameter (...) allows a function to treat an indefinite number of arguments as an array:

function sum(...args) {
  let sum = 0;
  for (let arg of args) sum += arg;
  return sum;
}

let x = sum(4, 9, 16, 25, 29, 100, 66, 77);

document.getElementById("demo").innerHTML = x;