Run results for: Sorting Algo

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36

Browser: Chrome 106

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Bubble Sort	283360.1 Ops/sec
Insertion Sort	484296.0 Ops/sec
Selection Sort	511732.8 Ops/sec
Merge Sort	187342.6 Ops/sec
Quick Sort	41685.1 Ops/sec

Script Preparation code:

window.arr = [19, 12, 14, 37, 26, 23, 0, 1, 17, 22, 29, 2, 7, 20, 33, 9, 10, 21, 6, 32, 24, 15, 11, 8, 36, 28, 31, 38, 34, 16, 18, 13, 25, 27, 35, 4, 3, 30, 5, 39]

window.bubbleSort = (arr) => {
      for(let i = 0; i < arr.length; i++){

        //Inner pass
        for(let j = 0; j < arr.length - i - 1; j++){

            //Value comparison using ascending order

            if(arr[j + 1] < arr[j]){

                //Swapping
                [arr[j + 1],arr[j]] = [arr[j],arr[j + 1]]
            }
        }
    };
    return arr;
}

window.insertionSort = (arr) => {
      for(let i = 1; i < arr.length;i++){

        //Go through the elements behind it.
        for(let j = i - 1; j > -1; j--){
            
            //value comparison using ascending order.
            if(arr[j + 1] < arr[j]){

                //swap
                [arr[j+1],arr[j]] = [arr[j],arr[j + 1]];

            }
        }
    };

  return arr;
}

window.selectionSort = (arr) => {
  let min;

  //start passes.
  for (let i = 0; i < arr.length; i++) {
    //index of the smallest element to be the ith element.
    min = i;

    //Check through the rest of the array for a lesser element
    for (let j = i + 1; j < arr.length; j++) {
      if (arr[j] < arr[min]) {
        min = j;
      }
    }

    //compare the indexes
    if (min !== i) {
      //swap
      [arr[i], arr[min]] = [arr[min], arr[i]];
    }
  }

  return arr;
}


window.merge = (arr1, arr2) => {
  //make a new array and have two value pointers
  let res = [],
    i = 0,
    j = 0;

  //sorting the first array.
  if (arr1.length > 1) {
    let min = 0;
    for (let i = 0; i < arr1.length; i++) {
      if (i !== min) {
        if (arr1[i] < arr1[min]) {
          //also swap the elements
          [arr1[i], arr1[min]] = [arr1[min], arr1[i]];
          //change the minimum
          min = i;
        }
      }
    }
  }

  //sorting the second array.
  if (arr2.length > 1) {
    let min = 0;
    for (let i = 0; i < arr2.length; i++) {
      if (i !== min) {
        if (arr2[i] < arr2[min]) {
          //also swap the elements
          [arr2[i], arr2[min]] = [arr2[min], arr2[i]];
          //change the minimum
          min = i;
        }
      }
    }
  }

  //Value comparison.
  while (i < arr1.length && j < arr2.length) {
    if (arr1[i] < arr2[j]) {
      res.push(arr1[i]);
      i++;
    } else {
      res.push(arr2[j]);
      j++;
    }
  }

  //pushing the rest of arr1.
  while (i < arr1.length) {
    res.push(arr1[i]);
    i++;
  }

  //pushing the rest of arr2.
  while (j < arr2.length) {
    res.push(arr2[j]);
    j++;
  }

  return res;
}

//merge sort
window.mergeSort = (arr) => {
  //Best case
  if (arr.length <= 1) return arr;

  //splitting into halves
  let mid = Math.ceil(arr.length / 2);

  let arr1 = arr.slice(0, mid);

  let arr2 = arr.slice(mid);

  let arr1_subarrays = [],
    sorted_arr1_subarrays = [];

  let arr2_subarrays = [],
    sorted_arr2_subarrays = [];

  //loop through array 1 making subarrays of two elements
  for (let i = 0; i < arr1.length; i += 2) {
    arr1_subarrays.push(arr1.slice(i, i + 2));
  }

  //loop through array 2 making subarrays of two elements.
  for (let i = 0; i < arr2.length; i += 2) {
    arr2_subarrays.push(arr2.slice(i, i + 2));
  }

  // sorting each subarray of arr1.
  for (let i = 0; i < arr1_subarrays.length; i += 2) {
    let result = merge(arr1_subarrays[i], arr1_subarrays[i + 1]);
    result.forEach((value) => sorted_arr1_subarrays.push(value));
  }

  // sorting each subarray of arr2.
  for (let i = 0; i < arr2_subarrays.length; i += 2) {
    let result = merge(arr2_subarrays[i], arr2_subarrays[i + 1]);
    result.forEach((value) => sorted_arr2_subarrays.push(value));
  }

  let result = merge(sorted_arr1_subarrays, sorted_arr2_subarrays);

  return result;
}

window.partition = (items, left, right) => {
  //rem that left and right are pointers.

  let pivot = items[Math.floor((right + left) / 2)],
    i = left, //left pointer
    j = right; //right pointer

  while (i <= j) {
    //increment left pointer if the value is less than the pivot
    while (items[i] < pivot) {
      i++;
    }

    //decrement right pointer if the value is more than the pivot
    while (items[j] > pivot) {
      j--;
    }

    //else we swap.
    if (i <= j) {
      [items[i], items[j]] = [items[j], items[i]];
      i++;
      j--;
    }
  }

  //return the left pointer
  return i;
}

window.quickSort = (items, left, right) => {
  let index;

  if (items.length > 1) {
    index = partition(items, left, right); //get the left pointer returned

    if (left < index - 1) {
      //more elements on the left side
      quickSort(items, left, index - 1);
    }

    if (index < right) {
      //more elements on the right side
      quickSort(items, index, right);
    }
  }

  return items;
}

Tests:

Bubble Sort
window.bubbleSort(window.arr);
Insertion Sort
window.insertionSort(window.arr)
Selection Sort
window.selectionSort(window.arr)
Merge Sort
window.mergeSort(window.arr)
Quick Sort
window.quickSort(window.arr, 0, window.arr.length - 1)

Run results for: Sorting Algo

Bubble Sort

Insertion Sort

Selection Sort

Merge Sort

Quick Sort