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JS Functions

Sum of all arguments:

function sumAll() {
  let sum = 0;
  for(let i = 0; i < arguments.length; i++) {
    sum += arguments[i];
  }
  return sum;
}
document.getElementById("demo").innerHTML = sumAll(1, 123, 500, 115, 44, 88);

If a function is called with too many arguments (more than declared), these arguments can be reached using the arguments object.