Default parameters in functions

interest.js

function interest(principal, rate, years) {
  rate = rate || 3.5;
  years = years || 5;

  return (principal * rate) / 100 * (years)
}

console.log(interest(10000));


//ES6
function interest(principal, rate = 3.5, years = 5) {
  return (principal * rate) / 100 * (years)
}

console.log(interest(10000));