JS-side argument validation

[Stephan Beal]

Hi, all,

i'm tinkering with some generic JS-side argument validation code and thought it might interest a couple of you. i'm not yet sure what it's for, and there's probably room for improvement, but it seems to work as it is now...

function applyValidation( func, rules ){

    return function(){

        var av = Array.prototype.slice.apply(arguments,[0]);

        rules( av );

        return func.apply( this, av );

    }

};

JSON.stringify = applyValidation( JSON.stringify,

                                  function(a){

                                      if(!a.length) throw new Error("!arguments.length");

                                  });

All that this does is shove argument validation rules between some function and arbitrary clients.

Now this throws: JSON.stringify()

but this doesn't: JSON.stringify({})

i'm not yet sure if it's useful, but it seems kinda interesting. My original attempt was to add a .validation property to arguments.callee, and reimplement Function.prototype.apply to check for these rules, but it seems i can't simply swap out Function.prototype.apply.

Happy Hacking!

--
----- stephan beal
http://wanderinghorse.net/home/stephan/

http://gplus.to/sgbeal