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It is recommended that the Javascript object arguments shouldn`t be modified, because arguments does not completely behave like an array. It is subjucted to automatic coercion rules which could make a function's arguments behaviour hard to predict.

A solution to achieve a safe modification could be by using the slice method. Here follows an example:

function anyFunction()
{
        //"Slice" converts the object "arguments" into an array
	var args = [].slice.call(arguments);
	
	//Outputs all existing arguments
	if(args.length > 0)
        {
		for(var i = 0; i < args.length; i++)
                {
			console.log(args[i]);
		}
	}
}

//Outputs: "Hello", "World" and 42
anyFunction("Hello","World", 42);

Also this kind of modification could give a function the possibility to decide which areas of parameters are allowed to use. Her comes an another example:

function anyFunction(a, b, c, d)
{

	//"Slice" converts the object "arguments" into an array
	var args = [].slice.call(arguments, 2);
	
	//Outputs every argument except the first two
	if(args.length > 0)
	{
		for(var i = 0; i < args.length; i++)
		{
			console.log(args[i]);
		}
	}
}

//Outputs: 42, "is" and "the number"
anyFunction("Hello", "World", 42, "is", "the number");

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