es5_default_parameters.js

// METHOD 1: Short-circuiting
// Using the logical OR (||) operator
function convertToBase(number, base) {
  number = parseInt(number) || 0;
  base = parseInt(base) || 10;
  
  return number.toString(base);
}

// METHOD 2: Ternary (?:) operator
// With additional type check (safer option)
function convertToBase(number, base) {
  number = (typeof number !== "undefined") ? parseInt(number) : 0;
  base = (typeof base !== "undefined") ? parseInt(base) : 10;
  
  return number.toString(base);
}