practical variable argument handling in node.js
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README.md

vargs

variable argument handling for functions taking a callback

rationale

JavaScript has very poor argument handling. vargs tries to make it simpler.

synopsis

var Args = new("vargs").Constructor;

function (/* [arg1, arg2, ...][,callback] */) {
    var args = new(Args)(arguments);
    
    args.first;    // first argument
    args.last;     // last argument before callback
    args.callback; // callback argument, or an empty function
    args.all;      // all arguments except callback
    args.length;   // number of arguments, not including callback
    
    args.callbackGiven(); // returns true or false
    args.at(-1);          // last argument, including callback
    args.array;           // all arguments, including callback
}

example

For a real-world example of vargs, check http://github.com/cloudhead/cradle