What role does ? operator play?

Given the following function (defn proint-down-from [x] (when (pos? x) (println x) (recur (dec x What role does the ? operator play. It looks like it is creating a variable name. Thanks. -- You received this message because you are subscribed to the Google Groups "Cloju

Re: What role does ? operator play?

Hi, The ? is merely a convention used to name predicate functions (ie. functions that return true or false). It is not enforced, but clojure.core follows it. It's a good idea to follow it. I think ruby has a similar convention. Thanks, Ambrose On Thu, May 19, 2011 at 9:09 PM, octopusgrabbus wro

Re: What role does ? operator play?

? isn't an operator, it is part of a function's name. user=> (doc pos?) - clojure.core/pos? ([x]) Returns true if num is greater than zero, else false nil user=> Hope that helps! Alex On Thu, May 19, 2011 at 8:09 AM, octopusgrabbus wrote: > Given the following function

Re: What role does ? operator play?

> What role does the ? operator play. It looks like it is creating a > variable name. > Thanks. > In clojure (and other languages like Ruby) the ? is not an operator, it's actually part of the function name. Normally ? means that the function returns a boolean. Think of it as asking a question, s

Aw: What role does ? operator play?

Hi, ? is not an operator, but part of the name "pos?". pos? is a function, which returns true if a number is positive, false otherwise. Function names ending in "?" by convention indicate that they return a boolean value (true or false). They are called "predicates". Sincerely Meikel PS: In f

Re: What role does ? operator play?

Many Thanks. I'm interested in learning Clojure and not everything is obvious in books. On May 19, 9:20 am, Meikel Brandmeyer wrote: > Hi, > > ? is not an operator, but part of the name "pos?". pos? is a function, which > returns true if a number is positive, false otherwise. > > Function names e