Skipping optional function parameters in JavaScript

Solution: goog.net.XhrIo.send(url, undefined, undefined, undefined, {‘Cache-Control’: ‘no-cache’}) You should use undefined instead of optional parameter you want to skip, because this 100% simulates the default value for optional parameters in JavaScript. Small example: myfunc(param); //is equivalent to myfunc(param, undefined, undefined, undefined); Strong recommendation: use JSON if you have a lot of parameters, and you can … Read more

How to create a polyvariadic haskell function?

The key points of printf is the ability to either return a String or a function. Copied from http://www.haskell.org/ghc/docs/6.12.2/html/libraries/base-4.2.0.1/src/Text-Printf.html, printf :: (PrintfType r) => String -> r printf fmts = spr fmts [] class PrintfType t where spr :: String -> [UPrintf] -> t instance (IsChar c) => PrintfType [c] where spr fmts args = … Read more

Why does a function with no parameters (compared to the actual function definition) compile?

All the other answers are correct, but just for completion A function is declared in the following manner: return-type function-name(parameter-list,…) { body… } return-type is the variable type that the function returns. This can not be an array type or a function type. If not given, then int is assumed. function-name is the name of … Read more