[jhgb]

Instead of

    function check(x) {
        if (!test1 (x))   return false;
        if (!test2 (x))   return false;
        if (!test3 (x))   return false;
        if (!test4 (x))   return false;
        return true;
    }

why wouldn't you do something along the lines of

    (every (lambda (f) (funcall f x)) (list #'test1 #'test2 #'test3 #'test4a))

or whatever is the equivalent in your preferred language?

[wvenable]

The tests are rarely that simple or regular.

[jhgb]

Isn't that exactly the reason to put them somewhere else?

[wvenable]

No, I just mean the actual tests might be something like:

    if (user == null) return false;
    if (IsCompleted(user)) return true;
    if (action == null) return false;
    if (value < 0 || value > 100) return false;   

You're not usually just passing a single value to a bunch of "test" functions.

[jhgb]

Well, the way it was written, I was assuming that conditions to be satisfied had separate named predicates (although combinators could alleviate even some of these things).