hoisting.js

/*
 * Variables declared with var are hoisted and initialized to undefined.
 * Variables declared with let, const, are hoisted but remain uninitialized.
 */

function letsFigureOutHoisting() {
  // VARIABLE NAMES ARE HOISTED PHYSICALLY HERE, AT THE TOP OF THE FUNCTION
  // we're referencing these variables BEFORE they are assigned values!
  console.log(cat); // will throw a ReferenceError
  console.log(dog); // will evaluate to undefined
  
  const cat = 'cat';
  var dog = 'dog';
}