Quiz: The "this" keyword

After 3 seconds, what will our code log?

var myUser = {

   username: 'tyler', 
   age: 25, 
   email: '[email protected]' 
 }; 
 var getMyUsername = function(){ 
   console.log(this.username); 
 }; 
 setTimeout(getMyUsername, 3000);

Tyler

Undefined

Throws an error

Null

What's the difference between .call and .apply?

.apply lets you pass in an array as the second argument, .call requires that parameters be listed explicitly

.call lets you pass in an array as the second argument, .apply requires that parameters be listed explicitly

What does .bind do

Invokes a function specifying the context ("this" keyword) inside that function

Returns a new function specifying the context ("this" keyword) inside that function

Binds the state of the function to a specified input field

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