11-ES6letconst.js

//******* EcmaScript 6: let and const keywords
// EcmaScript 6 Constants
const PI = 3.141593;
//PI = 3.0; //throws error
console.log(PI);

//******* EcmaScript 6: let is the new var
var framework = 'Angular';
var framework = 'React';
console.log(framework);

let language = 'JavaScript!';
//let language = 'Ruby!'; //throws error
console.log(language);

//******* EcmaScript 6: variables scope
let movie = 'Lord of the Rings';
//var movie = 'Batman v Superman'; //throws error, variable movie already declared

function starWarsFan(){
    let movie = 'Star Wars';
    return movie;
}

function marvelFan(){
    movie = 'The Avengers';
    return movie;
}

function blizzardFan(){
    let isFan = true;
    let phrase = 'Warcraft';
    console.log('Before if: ' + phrase);
    if (isFan){
        let phrase = 'initial text';
        phrase = 'For the Horde!';
        console.log('Inside if: ' + phrase);
    }
    phrase = 'For the Alliance!';
    console.log('After if: ' + phrase);
}

console.log(movie);
console.log(starWarsFan());
console.log(marvelFan());
console.log(movie);
blizzardFan();