Those are examples of higher-order functions that accept functions as arguments, but plenty of them return functions as well. If you’ve ever seen a function call that has two sets of parentheses ...

Having a good, high-level JavaScript framework, for example, means more time to push the boundaries and less time writing boring building-block code ... All MochiKit.Async Ajax functions return a ...

M4N asks:. Is there a reason why functions in most(?) programming languages are designed to support any number of input parameters but only one return value?