lenafaure

var greeting = "Hi, I am a global variable"; // global scope variable

function sayHello() {
  var greeting = "Hi, I am a local variable"; // local scope variable
  console.log(greeting);
}

sayHello(); // Prints "Hi, I am a local variable"
console.log(greeting); 	// Prints "Hi, I am a global variable"

lenafaure

var businessStar = “Gary Vaynerchuck”;

function businessStar(){
  console.log(“Gary Vaynerchuck”);
}

console.log(businessStar); // Prints “Gary Vaynerchuck”

lenafaure

var businessStar;

function businessStar(){
  console.log(“Gary Vaynerchuck”);
}

console.log(businessStar); // Prints “function businessStar(){ console.log(“Gary Vaynerchuck”);}”

lenafaure

var movieStar = function () {
  var name = “Philip Seymour Hoffman”;
  console.log(name); 
}

movieStar(); // Prints “Philipp Seymour Hoffman”

lenafaure

movieStar(); // Prints “TypeError : movieStar is not a function”

var movieStar = function () {  // This is a function expression and therefore not hoisted
  var name = “Philip Seymour Hoffman”;
  console.log(name); 
}

lenafaure

function movieStar() { // function declaration is moved to the top of the global scope
  var name; // variable declaration is moved to the top of the local scope 
  name = “Meryl Streep”; // variable assignement is left in place
  console.log(name);
}

movieStar(); // Prints “Meryl Streep”

lenafaure

movieStar();

function movieStar() {
  var name = “Meryl Streep”;
  console.log(name);
}

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var rockStar;
console.log(rockStar);
rockStar = “Mick Jagger”;

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var rockStar;
rockStar = “Mick Jagger”;

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console.log(rockStar); // Prints “undefined”
var rockStar = “Mick Jagger”;