Usefulness. Having functions return stuff, instead of passing arguments by reference/pointer, is specially useful when you can use the return value in an expression, or argument to another function ...

As in most programming languages, the expression is an important part of JavaScript, but it isn't quite the same. This is where the idea that JavaScript has some weird type conversions arises. But in ...

If you’re returning information from a then or catch handler, it will always be wrapped in a promise, if it isn’t a promise already. So, you never need to write code like this: If you are unsure if ...