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  1. //
  2. // Loops: While, For, For in
  3.  
  4. // Looping allows us to iterate over collections. A for loop is great for arrays.
  5. // A for-in loop is great for objects. A while loop loops over a condition
  6. // as long as it is true
  7.  
  8. // For loop
  9.  
  10. var array = [1, 2, 3, 4, 5];
  11.  
  12. for (var i = 0; i < array.length; i++) {
  13. console.log(array[i]);
  14. }
  15.  
  16. // above, we've looped throug var array in increments of 1 up to value 5
  17.  
  18. for (var j = array.length-1; j > -1; j--) {
  19. console.log(array[j]);
  20. }
  21.  
  22. // above, we've looped down through var array in decrements of 1 down to value 1
  23.  
  24. for (var k = array.length-1; k > -1; k -= 2) {
  25. console.log(array[k]);
  26. }
  27.  
  28. // above, we've looped down through var array in decrements of 2 from value 5
  29. // down to value 1
  30.  
  31.  
  32.  
  33.  
  34. // For in loop
  35.  
  36. var object = {nameFirst: "Jay", nameMiddle: "J", nameLast: "Smith"};
  37. for (var key in object){
  38. console.log(object[key]);
  39. }
  40.  
  41. // above, we've looped through var object
  42. </script>
  43.  
  44.  
  45.  
  46. <script id="jsbin-source-javascript" type="text/javascript">// Loops: While, For, For in
  47.  
  48. // Looping allows us to iterate over collections. A for loop is great for arrays.
  49. // A for-in loop is great for objects. A while loop loops over a condition
  50. // as long as it is true
  51.  
  52. // For loop
  53.  
  54. var array = [1, 2, 3, 4, 5];
  55.  
  56. for (var i = 0; i < array.length; i++) {
  57. console.log(array[i]);
  58. }
  59.  
  60. // above, we've looped throug var array in increments of 1 up to value 5
  61.  
  62. for (var j = array.length-1; j > -1; j--) {
  63. console.log(array[j]);
  64. }
  65.  
  66. // above, we've looped down through var array in decrements of 1 down to value 1
  67.  
  68. for (var k = array.length-1; k > -1; k -= 2) {
  69. console.log(array[k]);
  70. }
  71.  
  72. // above, we've looped down through var array in decrements of 2 from value 5
  73. // down to value 1
  74.  
  75.  
  76.  
  77.  
  78. // For in loop
  79.  
  80. var object = {nameFirst: "Jay", nameMiddle: "J", nameLast: "Smith"};
  81. for (var key in object){
  82. console.log(object[key]);
  83. }
  84.  
  85. // above, we've looped through var object
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