If you write JavaScript, you have probably used higher-order functions and not even noticed. If you have ever replaced a for loop with an array method, you’ve used higher-order functions.

In general, "return false" is correct. "javascript:void (0)" is a common but bad practice. It's also better to make the href point to something (for example, a page saying that JavaScript isn't ...

For the types of functions you're talking about (ie. functions that return multiple values, of different types) I see it slightly differently than you seem to: I see the need/use of out params as ...