dropbox_javascript_test.js

// Given the following javascript code:

function countdown (num) {
  for (var i = 0; i <= num; i += 1) {
    setTimeout(function () {
      alert(num - i);
    }, i * 1000);
  }
}

countdown(5);

// The desired result is a countdown from 5 to 0 using alert messages.
// Explain why the code only alerts -1, then fix the code so it works as expected