These are references to objects you did not create. They are like ... to keep in mind when naming your variables: Unlike some other programming languages, JavaScript does not require you to ...

In JavaScript, for example, you can assign a number to a variable named "x" as easily as you can assign the word "apple" to it. This flexibility allows you to create programs without worrying ...

Developers use JavaScript ... Learning how to create promises will help you understand how libraries use them. It also puts a powerful asynchronous programming mechanism at your disposal.