aaronfrost

run();
var run = function(){
    console.log(“running”);
}
run();

aaronfrost

var run = undefined;
run(); //error, since undefined isn’t a function
run = function(){
    console.log(“running”);
}
run();

aaronfrost

let foo = 0;
if(true){
     let bar = 1;
}
console.log( foo + bar );
//results in runtime error, bar is not defined

aaronfrost

let a = 0; 
if(true){
    let a = 2;
    console.log(“here a = “,a);
}
console.log(“at the end a = “,a);

aaronfrost

var thingsCount = 0;
var   urls = []
	, deferreds = []
;

var mainDeferred = $.Deferred();
deferreds.push(mainDeferred);

$.get('https://www.lds.org/directory/services/ludrs/unit/current-user-units/',function(r){
    

aaronfrost

function foo(){
    var temp = bar();
    return temp;
}

/*
	Is this a tail call? the call to bar is not actually in tail position, however 
	it is the last instruction to 	execute before the return expression. Let me know. 
*/

aaronfrost

// 1. GLOBAL THIS (ie: window object)
console.log(this);
function foo(){
    console.log(this);  //logs the window object
}
foo();

aaronfrost

// 2. Objects
function Foo(){
    this.bar = function(){
    	console.log(this);
    }
    return this;
}
new Foo().bar();   //logs a new Foo object

aaronfrost

// Problem with the current way. Closures explode!!!
function Aaron(){
    this.favoriteSaying = "I love Google!";
    this.saySomething = function(){
        console.log(this.favoriteSaying);
    }
}
var a = new Aaron();
a.saySomething();     //logs "I love Google!"

aaronfrost

// Problem with the current way. Closures explode!!!
function Aaron(){
    var me = this; // or that, _this, self, etc
    this.favoriteSaying = "I love Google!";
    this.saySomething = function(){
        console.log(me.favoriteSaying);
    }
}
var a = new Aaron();
a.saySomething();     //logs "I love Google!"