JavaScript/Sorts/SelectionSort.js

/* The selection sort algorithm sorts an array by repeatedly finding the minimum element
 *(considering ascending order) from unsorted part and putting it at the beginning. The
 *algorithm maintains two subarrays in a given array.
 *1) The subarray which is already sorted.
 *2) Remaining subarray which is unsorted.
 *
 *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++) {
    // Number of passes
    var min = i // min holds the current minimum number position for each pass; i holds the Initial min number
    for (var j = i + 1; j < length; j++) { // Note that j = i + 1 as we only need to go through unsorted array
      if (items[j] < items[min]) { // Compare the numbers
        min = j // Change the current min number position if a smaller num is found
      }
    }
    if (min !== i) {
      // After each pass, if the current min num != initial min num, exchange the position.
      // Swap the numbers
      [items[i], items[min]] = [items[min], [items[i]]]
    }
  }
}

// Implementation of Selection Sort

var ar = [5, 6, 7, 8, 1, 2, 12, 14]
// Array before Sort
console.log(ar)
selectionSort(ar)
// Array after sort
console.log(ar)