Function Hoisting

In Python, a function must be defined before any code that executes it. But that's not so in JavaScript! As long as a function is defined somewhere in the file, it can be called even before the definition.

console.log(getLabel(3));
// prints 'awful'

function getLabel(numStars) {
  if (numStars > 7) {
    return "great";
  } else if (numStars > 3) {
    return "okay";
  } else {
    return "awful";
  }
}

This works because JavaScript "hoists" the function declaration to the top of the file before the code is executed.