The same as .splice(), but without side effects. "replace" can be several items and the funciton will still work cleanly

spliceClean

var spliceClean = function(arr, start, numToReplace, replace) {

  var end = (start+numToReplace-1)
	var newArray = [];

	for (i=0; i<arr.length; i++){
		(i < start) ? newArray.push(arr[i]) : console.log("rejected")
	}
	for (i=3; i<arguments.length; i++){
		newArray.push(arguments[i])
	}
	for (i=0; i<arr.length; i++){
		(end< i) ? newArray.push(arr[i]) : console.log("rejected")
	}
	return newArray;

}