A function has three general tasks it can perform; it optionally takes an input, does some processing and optionally ... For it to do something, we have to add some code inside of it. Function ...

you can have only single input functions, and still semantically get multiple inputs using currying). For multi-valued functions (eg. squared root of a positive integer, for example), it's ...

Testing functions isn't hard ... One of the main topics I didn't cover in my last article is user input and output. How can you test programs that expect to get input from files or from the user? And, ...