Add selection sort in es6

Author: benoitvallon

sorting-algorithms-in-javascript/selection-sort-counters.es6.js

@@ -0,0 +1,32 @@
+// sample of arrays to sort
+const arrayRandom = [9, 2, 5, 6, 4, 3, 7, 10, 1, 8];
+const arrayOrdered = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+const arrayReversed = [10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
+
+function selectionSort(array) {
+  let countOuter = 0;
+  let countInner = 0;
+  let countSwap = 0;
+
+  for(let i = 0; i < array.length; i++) {
+    countOuter++;
+    let min = i;
+    for(let j = i + 1; j < array.length; j++) {
+      countInner++;
+      if(array[j] < array[min]) {
+        min = j;
+      }
+    }
+    if(i !== min) {
+      countSwap++;
+      [array[i], array[min]] = [array[min], array[i]];
+    }
+  }
+
+  console.log('outer:', countOuter, 'inner:', countInner, 'swap:', countSwap);
+  return array;
+}
+
+selectionSort(arrayRandom.slice()); // => outer: 10 inner: 45 swap: 5
+selectionSort(arrayOrdered.slice()); // => outer: 10 inner: 45 swap: 0
+selectionSort(arrayReversed.slice()); // => outer: 10 inner: 45 swap: 5

sorting-algorithms-in-javascript/selection-sort.es6.js

@@ -0,0 +1,19 @@
+// array to sort
+const array = [9, 2, 5, 6, 4, 3, 7, 10, 1, 8];
+
+function selectionSort(array) {
+  for(let i = 0; i < array.length; i++) {
+    let min = i;
+    for(let j = i + 1; j < array.length; j++) {
+      if(array[j] < array[min]) {
+        min = j;
+      }
+    }
+    if(i !== min) {
+      [array[i], array[min]] = [array[min], array[i]];
+    }
+  }
+  return array;
+}
+
+console.log(selectionSort(array)); // => [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]