pass by value

apples.js

var a = [2];
var b = 3;
var c = new Number(4);
console.log(a instanceof Object, b instanceof Object, c instanceof Object);

function monkey(h, i, j) {
console.log(typeof h, typeof i, typeof j);
  return [++h[0], ++i, ++j];
}

console.log(monkey(a, b, c));
console.log(a, b, c);