04-selection-sort.js

function selectionSort(array) {
  var swap = function(x, y) {
    var temp = array[x];
    array[x] = array[y];
    array[y] = temp;
  };

  for (var i = 0, length = array.length; i < length - 1; i++) {
    var minIndex = i;
    for (var j = i + 1; j < length; j++) {
      if (array[j] < array[minIndex]) {
        minIndex = j;
      }
    }
    swap(i, minIndex);
  }

  return array;
}

(function(sort) {
  var random = function(max) {
    var array = [];
    for (var i = 0; i < max; i++) {
      array[i] = i;
    }
    array.sort(function() {
      return 0.5 - Math.random();
    });
    return array;
  };

  var test = function(count) {
    for (var i = 0; i < count; i++) {
      var array = random(10);
      console.log('[No.' + (i + 1) + '] begin: ', array);
      console.time('time');
      console.log('[No.' + (i + 1) + '] end: ', sort(array));
      console.timeEnd('time');
    }
  };

  test(3);
}(selectionSort));