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Message: [QUOTE="Richard Cornford, post: 4708078"] That possibility didn't occur to me, but it does need to be covered. And thinking about the possibility that the parameter adding function may be called without an argument it also occurred to me that the function (func) itself may not require any parameters, which you have covered here. However, if the function needs no parameters (func.length == 0) shouldn't the value returned at this point be the result of calling that function? As my version allows the initial call to curry to be supplied with all of the required parameters and will execute the function if they are all present I went with executing the function in curry if func.length == 0. Being reminded of the belts and braces was useful, here are my corrections for those (at least the ones I have noticed so far):- function curry(f){ var retVal,obj = this; //global, unless this function //is assigned as a method. arguments.callee.depth = 0; function getArgFunc(args, af){ function argFunc(x){ var retVal; var argsLen = arguments.length; var self = arguments.callee; function getArgs(){ var ar = self.getArgs(); if(argsLen){ar[ar.length] = x;} return ar; } if(self.depth >= f.length){ retVal = f.apply(obj, getArgs()); }else if(!argsLen){ retVal = self; }else{ retVal = getArgFunc(arguments, getArgs); } return retVal; } argFunc.depth = args.callee.depth+1; argFunc.getArgs = af; for(var c = 1;c < args.length;c++){ argFunc = argFunc(args[c]); if((typeof argFunc != 'function')||(!argFunc.getArgs)){ break; } } af = (args = null); return argFunc; } retVal = getArgFunc(arguments, function(){return [];}); return (f.length)?retVal:retVal(); } Richard. [/QUOTE]

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