maxDiff,js

/*
 * Complete the function below.
 * this function works in every case were an array of integers is passed in to it on my local server (not using node and using form input)
 * I have no access to the test cases that are failing or even the error or output so I cannot debug effectively
 * see code at https://github.com/freddiv/Tenable-CodeChallenge for a custom implementation 
 * custom implementation works whether it is numeric or string values
 * it also handles errors such as an alpha value being passed in the array 
 * and the first value in the input string not correctly indicating the array length
 * input can be space or comma delimited
 */
function maxDifference(a) {
      var arr = a,
	 	 returnVal = -1,
	 	 newArr = arr.slice(0),
	 	 maxNumber = Math.max.apply(null, newArr),
	 	 finalArrLen = newArr.indexOf(maxNumber),
	 	 finalArray = newArr.slice(0,finalArrLen),
	 	 minNumber = parseInt(Math.min.apply(null, finalArray)),
	 	 numDiff = (maxNumber - minNumber);
	 if(!isNaN(numDiff)) {
		 returnVal = numDiff;
	 }
    
	  return returnVal;
	}