Simple js asspects

js asspect

var Asspect = (function(){

  var add = function(object, functionName, opts){
    object = object || window;

    var originalFunction = object[functionName];

    // check if function exists

    object[functionName] = function(){
      if (opts.before){
        opts.before.apply(object, arguments);
      }

      var originalFunctionCall = originalFunction.apply(object, arguments);

      if (opts.after){
        opts.after.apply(object, arguments);
      }

      return originalFunctionCall;
    };

  };

  return {
    add: add
  };
}());

var foo = function(a){ console.log(a); };

var before = function(){ console.log("before"); };
var after = function(){ console.log("after"); };

Asspect.add(null, 'foo', {before:before, after:after});