Javascript Course

The function presented bellow can be used to shuffle /randomize array items in JavaScript.


Script code

// receive an array and return it with the items shuffled /randomized
function shuffle(ar){
 for(var j, x, i = ar.length; i; j = Math.floor(Math.random() * i), x = ar[--i], ar[i] = ar[j], ar[j] = x);
 return ar;
}
- Here is a simple example:
<h4>Example shuffle array in JavaScript</h4>
<p>Initial array: ar1 = ['a', 'b', 'c', 1, 2, 3];</p>

<button id='btntst'>Test Shuffle Array</button>
<script>
// receive an array and return it with the items shuffled /randomized
function shuffle(ar){
 for(var j, x, i = ar.length; i; j = Math.floor(Math.random() * i), x = ar[--i], ar[i] = ar[j], ar[j] = x);
 return ar;
}

var ar1 = ['a', 'b', 'c', 1, 2, 3];

//when click on the #btntst, show alert box with the items of ar1
document.getElementById('btntst').addEventListener('click', function(){
 ar1 = shuffle(ar1);
 alert(ar1);
});
</script>
Demo:
Initial array: ar1 = ['a', 'b', 'c', 1, 2, 3];

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
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<map> <img> <area>
<img src="image.jpg" usemap="#map1">
<map name="map1">
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</map>
Which CSS property defines what is done if the content in a box is too big for its defined space?
display overflow position
#id {
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Click on the event which is triggered when the mouse is positioned over an object.
onclick onmouseover onmouseout
document.getElementById("id").onmouseover = function(){
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}
Indicate the PHP variable that contains data added in URL address after the "?" character.
$_SESSION $_GET $_POST
if(isset($_GET["id"])) {
  echo $_GET["id"];
}
Shuffle / Randomize Array in JavaScript

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