OptionalArguments.js

// alert requires only one argument, the 2nd and 3rd arguments are ignored and alerts only "Hello"
alert("Hello", "Good Evening", "How do you do?"); 

function power(base, exponent) {
  if (exponent == undefined) {
    debugger;
    exponent = 2;
  }
  var result = 1;
  for (var count = 0; count < exponent; count++) {
    debugger;
    result *= base;
  }
  return result;
}

console.log(power(4)); 
// passing only one argument will result exponent to have undefined value, so the if block condition is met, assigning 2 to exponent
// → 16
console.log(power(4, 3));
// → 64