gistfile1.js

function join() {
  return [].join.call(arguments);
}


var readFooFile = naan.curry(fs.readFile, "foo.txt", "utf8");
var readBarFile = naan.curry(fs.readFile, "bar.txt", "utf8");


// readFooFile and readBarFile now take one argument, the callback, and
always 
// read either foo.txt or bar.txt.


var joinWithFiles = naan.cook(join, [readFooFile, readBarFile], true, false);
// Now, when joinWithFiles is called, the first two arguments will be the 
// contents of foo.txt and bar.txt respectively.
//
// So, if foo.txt contains "Hello", and bar.txt contains "World":
joinWithFiles("!", function(err, value) {
  console.log(value); // -> "Hello,World,!"
}); 


// Also note that `join` didn't have a callback, but since two of the
arguments
// are resolved asynchronously, naan inferred that we needed one now.