sorts/

Author: itsvinayak

Sorts/TopologicalSort.js

@@ -1,60 +1,59 @@
 
-function TopologicalSorter() {
-    var graph = {},
-        isVisitedNode,
-        finishTimeCount,
-        finishingTimeList,
-        nextNode;
-
-    this.addOrder = function (nodeA, nodeB) {
-        nodeA = String(nodeA);
-        nodeB = String(nodeB);
-        graph[nodeA] = graph[nodeA] || [];
-        graph[nodeA].push(nodeB);
-    }
-    
-    this.sortAndGetOrderedItems = function () {
-        isVisitedNode = Object.create(null);
-        finishTimeCount = 0;
-        finishingTimeList = [];
-
-        for (var node in graph) {
-            if (graph.hasOwnProperty(node) && !isVisitedNode[node]) {
-                dfsTraverse(node);
-            }
-        }
-
-        finishingTimeList.sort(function (item1, item2) {
-            return item1.finishTime > item2.finishTime ? -1 : 1;
-        });
-
-        return finishingTimeList.map(function (value) { return value.node })
+function TopologicalSorter () {
+  var graph = {}
+  var isVisitedNode
+  var finishTimeCount
+  var finishingTimeList
+  var nextNode
+
+  this.addOrder = function (nodeA, nodeB) {
+    nodeA = String(nodeA)
+    nodeB = String(nodeB)
+    graph[nodeA] = graph[nodeA] || []
+    graph[nodeA].push(nodeB)
+  }
+
+  this.sortAndGetOrderedItems = function () {
+    isVisitedNode = Object.create(null)
+    finishTimeCount = 0
+    finishingTimeList = []
+
+    for (var node in graph) {
+      if (Object.prototype.hasOwnProperty.call(graph, node) && !isVisitedNode[node]) {
+        dfsTraverse(node)
+      }
     }
 
-    function dfsTraverse(node) {
-        isVisitedNode[node] = true;
-        if (graph[node]) {
-            for (var i = 0; i < graph[node].length; i++) {
-                nextNode = graph[node][i];
-                if (isVisitedNode[nextNode]) continue;
-                dfsTraverse(nextNode);
-            }
-        }
-
-        finishingTimeList.push({
-            node: node,
-            finishTime: ++finishTimeCount
-        });
+    finishingTimeList.sort(function (item1, item2) {
+      return item1.finishTime > item2.finishTime ? -1 : 1
+    })
+
+    return finishingTimeList.map(function (value) { return value.node })
+  }
+
+  function dfsTraverse (node) {
+    isVisitedNode[node] = true
+    if (graph[node]) {
+      for (var i = 0; i < graph[node].length; i++) {
+        nextNode = graph[node][i]
+        if (isVisitedNode[nextNode]) continue
+        dfsTraverse(nextNode)
+      }
     }
-}
 
+    finishingTimeList.push({
+      node: node,
+      finishTime: ++finishTimeCount
+    })
+  }
+}
 
 /* TEST */
-var topoSorter = new TopologicalSorter();
-topoSorter.addOrder(5, 2);
-topoSorter.addOrder(5, 0);
-topoSorter.addOrder(4, 0);
-topoSorter.addOrder(4, 1);
-topoSorter.addOrder(2, 3);
-topoSorter.addOrder(3, 1);
-console.log(topoSorter.sortAndGetOrderedItems());
+var topoSorter = new TopologicalSorter()
+topoSorter.addOrder(5, 2)
+topoSorter.addOrder(5, 0)
+topoSorter.addOrder(4, 0)
+topoSorter.addOrder(4, 1)
+topoSorter.addOrder(2, 3)
+topoSorter.addOrder(3, 1)
+console.log(topoSorter.sortAndGetOrderedItems())

Sorts/bubblesort.js

@@ -1,66 +1,65 @@
-/*Bubble Sort is a algorithm to sort an array. It
+/* Bubble Sort is a algorithm to sort an array. It
 * compares adjacent element and swaps thier position
-* The big O on bubble sort in worst and best case is O(N^2). 
+* The big O on bubble sort in worst and best case is O(N^2).
  * Not efficient.
 */
-function bubbleSort(items) {
-    let length = items.length;
-    for (let i = (length - 1); i > 0; i--) {
-        //Number of passes
-        for (let j = (length - i); j > 0; j--) {
-            //Compare the adjacent positions
-            if (items[j] < items[j - 1]) {
-                //Swap the numbers
-                let tmp = items[j];
-                items[j] = items[j - 1];
-                items[j - 1] = tmp;
-            }
-        }
+
+function bubbleSort (items) {
+  const length = items.length
+  for (let i = (length - 1); i > 0; i--) {
+    // Number of passes
+    for (let j = (length - i); j > 0; j--) {
+      // Compare the adjacent positions
+      if (items[j] < items[j - 1]) {
+        // Swap the numbers
+        const tmp = items[j]
+        items[j] = items[j - 1]
+        items[j - 1] = tmp
+      }
     }
+  }
 }
 
-//Implementation of bubbleSort
+// Implementation of bubbleSort
 
-var ar=[5,6,7,8,1,2,12,14];
-//Array before Sort
-console.log("-----before sorting-----")
-console.log(ar);
-bubbleSort(ar);
-//Array after sort
-console.log("-----after sorting-----")
-console.log(ar);
+var ar = [5, 6, 7, 8, 1, 2, 12, 14]
+// Array before Sort
+console.log('-----before sorting-----')
+console.log(ar)
+bubbleSort(ar)
+// Array after sort
+console.log('-----after sorting-----')
+console.log(ar)
 
-/*alternative implementation of bubble sort algorithm.
+/* alternative implementation of bubble sort algorithm.
  Using a while loop instead. For educational purposses only
  */
 /*
 *In bubble sort, we keep iterating while something was swapped in
-*the previous inner-loop iteration. By swapped I mean, in the 
-*inner loop iteration, we check each number if the number proceeding 
+*the previous inner-loop iteration. By swapped I mean, in the
+*inner loop iteration, we check each number if the number proceeding
 *it is greater than itself, if so we swap them.
 */
 
-function bubbleSort(arr){
-    let swapped = true;
-    while(swapped){
-        swapped = false;
-        for(let i = 0; i < arr.length-1; i++){
-            if(arr[i] > arr[i + 1]){
-                let temp = arr[i];
-                arr[i] = arr[i + 1];
-                arr[i + 1] = temp;
-                swapped = true;
-            }
-        }
+function alternativeBubbleSort (arr) {
+  let swapped = true
+  while (swapped) {
+    swapped = false
+    for (let i = 0; i < arr.length - 1; i++) {
+      if (arr[i] > arr[i + 1]) {
+        const temp = arr[i]
+        arr[i] = arr[i + 1]
+        arr[i + 1] = temp
+        swapped = true
+      }
     }
-    return arr;
+  }
+  return arr
 }
 
-//test
-console.log("-----before sorting-----")
-var array = [10,5,3,8,2,6,4,7,9,1];
-console.log(array);
-console.log("-----after sorting-----")
-console.log(bubbleSort(array));
-
-
+// test
+console.log('-----before sorting-----')
+var array = [10, 5, 3, 8, 2, 6, 4, 7, 9, 1]
+console.log(array)
+console.log('-----after sorting-----')
+console.log(alternativeBubbleSort(array))

Sorts/bucketSort.js

@@ -52,9 +52,11 @@ function bucketSort (list, size) {
   }
   return sorted
 }
+
+// Testing
 const arrOrignal = [5, 6, 7, 8, 1, 2, 12, 14]
 // Array before Sort
 console.log(arrOrignal)
-arrSorted = bucketSort(arrOrignal)
+const arrSorted = bucketSort(arrOrignal)
 // Array after sort
 console.log(arrSorted)

Sorts/combSort.js

@@ -14,6 +14,7 @@ elements goes down (for each iteration of outer loop) in steps of
 a "shrink factor" k: [ n/k, n/k2, n/k3, ..., 1 ].
 
 */
+
 function combSort (list) {
   if (list.length === 0) {
     return list
@@ -45,6 +46,6 @@ function combSort (list) {
 const arrOrignal = [5, 6, 7, 8, 1, 2, 12, 14]
 // Array before Sort
 console.log(arrOrignal)
-arrSorted = combSort(arrOrignal)
+const arrSorted = combSort(arrOrignal)
 // Array after sort
 console.log(arrSorted)

Sorts/cycleSort.js

@@ -5,6 +5,7 @@ number of writes to the original array, unlike any other in-place sorting
 algorithm. It is based on the idea that the permutation to be sorted can
 be factored into cycles, which can individually be rotated to give a sorted result.
 */
+
 function cycleSort (list) {
   let writes = 0
   for (let cycleStart = 0; cycleStart < list.length; cycleStart++) {
@@ -18,11 +19,11 @@ function cycleSort (list) {
       }
     }
     // if its the same continue
-    if (position == cycleStart) {
+    if (position === cycleStart) {
       continue
     }
 
-    while (value == list[position]) {
+    while (value === list[position]) {
       position++
     }
 
@@ -32,14 +33,14 @@ function cycleSort (list) {
     writes++
 
     // rotate the rest
-    while (position != cycleStart) {
+    while (position !== cycleStart) {
       position = cycleStart
       for (let i = cycleStart + 1; i < list.length; i++) {
         if (list[i] < value) {
           position++
         }
       }
-      while (value == list[position]) {
+      while (value === list[position]) {
         position++
       }
       const oldValueCycle = list[position]

Sorts/heapSort.js

@@ -5,6 +5,7 @@
 * key (the value) of node P is greater than the key of node C"
 * Source: https://en.wikipedia.org/wiki/Heap_(data_structure)
 */
+
 Array.prototype.heapify = function (index, heapSize) {
   let largest = index
   const leftIndex = 2 * index + 1

Sorts/selectionSort.js

@@ -7,6 +7,7 @@
  *In every iteration of selection sort, the minimum element (considering ascending order)
  *from the unsorted subarray is picked and moved to the sorted subarray.
  */
+
 function selectionSort (items) {
   var length = items.length
   for (var i = 0; i < length - 1; i++) {
@@ -17,7 +18,7 @@ function selectionSort (items) {
         min = j // Change the current min number position if a smaller num is found
       }
     }
-    if (min != i) {
+    if (min !== i) {
       // After each pass, if the current min num != initial min num, exchange the position.
       // Swap the numbers
       var tmp = items[i]