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function bubbleSort(arr) {
  for (var i = 0; i < arr.length - 1; i++) {
    for(var j = 0; j < arr.length - i - 1; j++ ) {
      if (arr[j] > arr[j + 1]) {
	var temp = arr[j];
  	arr[j] = arr[j + 1];
  	arr[j + 1] = temp;
      }
    }
  }

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var quickSort = function(array, left, right){

  var leftIndex = partition(array, left, right);

  if (left < leftIndex - 1){
    quickSort(array, left, leftIndex-1);
  }
  
  if (right > leftIndex){
    quickSort(array, leftIndex, right);

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function mergeSort (arr) {
  if (arr.length < 2) {
    return arr;
  }

  var mid = Math.floor(arr.length / 2);
  var subLeft = mergeSort(arr.slice(0, mid));
  var subRight = mergeSort(arr.slice(mid));

  return merge(subLeft, subRight);

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function fizzBuzz(to) {
  for (var i=1; i <= to; i++) {
    if (i % 15 == 0)
      console.log("FizzBuzz");
    else if (i % 3 == 0)
      console.log("Fizz");
    else if (i % 5 == 0)
      console.log("Buzz");
    else
      console.log(i);

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function checkSum(arr, sum) {
	let low = 0,
	  high = arr.length - 1;

	while(low < high) {
	  let s = arr[low] + arr[high];

		if (s === sum) return true
		if (s < sum) {
			low = low + 1

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function checkUnorderedSum(arr, sum) {
	let alreadySeen = [];

	for (var i = 0; i < arr.length; i++) {
	  let complement = sum - arr[i];

	  if (alreadySeen.indexOf(arr[i]) > -1) {
	  	return true
	  }

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function findDuplicates(arr) {
  for (var i = 0; i < arr.length; i++){
    if (arr[Math.abs(arr[i])] >= 0) {
      arr[Math.abs(arr[i])] = -arr[Math.abs(arr[i])]
    } else {
      console.log(Math.abs(arr[i] + " "));
    }
  }
}

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function isPrime(value) {
  for(var i = 2; i < value; i++) {
    if(value % i === 0) {
      return false;
    }
  }
  return value > 1;
}

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//Using built-in functions
function reverseString(str) {
  return str.split("").reverse().join("");	
}

//Without built-in functions
function reverseString(str) {
    var newString = "";
    for (var i = str.length - 1; i >= 0; i--) {
        newString += str[i];

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//v1 without built in functions
function palindrome(str) {
    var len = str.length,
      mid = Math.floor(len/2);
      
    for ( var i = 0; i < mid; i++ ) {
        if (str[i] !== str[len - 1 - i]) {
            return false;
        }
    }