Conditional 'if' Statements in JavaScript

When writing JavaScript code, you'll often need to perform certain tasks based certain criteria.

For example, if I have a login form:

I'll probably need to create the following logic:

If the user enters a valid username and password, I need to log the user in. Otherwise, I'll need to display an "invalid credentials" message.

Let's see how we can create this logic.

Next: The 'if' Statement in JavaScript