EcmaScript 6 const and let examples

Author: loiane

chapter01/02-Variables.js

@@ -14,6 +14,21 @@ console.log("price: "+ price);
 console.log("nullVar: "+ nullVar);
 console.log("und: "+ und);
 
+//******* 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);
+
 //******* Variable Scope
 
 var myVariable = 'global';
@@ -35,3 +50,36 @@ console.log(myFunction()); //{2}
 console.log(myOtherVariable);   //{3}
 console.log(myOtherFunction()); //{4}
 console.log(myOtherVariable);   //{5}
+
+//******* 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();