The one time that you don’t need to compare values to make a decision is when the value is what is known as a Boolean value. A Boolean value is either true or false (those are the only two values it can have) and we can therefore make decisions based on the value of a [...]

Most of the time in making decisions you need to compare something with something else. The tutorials on how JavaScript makes decisions therefore begins with information on how JavaScript handles comparing two values.
Comparison Operators

Back in March a book publisher asked me to write a new book on JavaScript for them. I had the book all planned out and had written draft copies of several chapters before deciding that I just wasn’t going to have enough time to write the book in any acceptable amount of time. I therefore [...]