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
Which attribute is used in <img> tag for the address of the image?
href src rel
<img src="http://coursesweb.net/imgs/webcourses.gif" width="191" height="63" alt="Courses-Web" />
Which CSS code hides the element on page?
display: none; display: inline; position: relative;
#id {
  display: none;
}
What instruction stops the execution of a while() or for() statement?
continue prompt() break
for(var i = 0; i< 8; i++) {
  if(i > 1) break;
  alert(i);
}
Indicate the function that can create a constant.
define() include() defined()
define("CONSTANT_NAME", "value");
echo CONSTANT_NAME;
Shuffle / Randomize Array in JavaScript

Last accessed pages

  1. The Truth Is (569)
  2. Insert, Select and Update NULL value in MySQL (58934)
  3. Convert XML to JSON in JavaScript (33876)
  4. HTML5 Quick Tutorial (4939)
  5. SHA512 Encrypt hash in JavaScript (24675)

Popular pages this month

  1. Courses Web: PHP-MySQL JavaScript Node.js Ajax HTML CSS (585)
  2. PHP Unzipper - Extract Zip, Rar Archives (280)
  3. SHA1 Encrypt data in JavaScript (186)
  4. Read Excel file data in PHP - PhpExcelReader (149)
  5. Get and Modify content of an Iframe (141)