A while loop just looks at a short comparison and repeats until the comparison is no longer True.

The while() loop

The while() loops executes a code as long as a condition is True. If the condition starts out as false, the statements won’t execute at all.

- Syntax:
 //code to be executed
var i =0;
 document.write('<br /> i = '+i);
- First it's declared a variable 'i' with the value of 0. The 'while' statement checks the condition (here: i<5), which it's True and permits the execution of block code inside the brackets. The 'i++' increments the value of 'i' and check again the condition. The loop will stop when the 'i' reach 5.

do ... while() loops

The do...while() loop is a variant of the while() loop. First it is executed the block of code, and then it will repeat the loop as long as the specified condition is true.

do {
 //code to be executed
Here is a simple example:
var x = 8;
do {
 document.write('<br> x = '+x);
- This example display 'x = 8'.
As you can notice, although the condition is false (x<5), the code between braces is still executed once.

Daily Test with Code Example

Which attribute specifies the HTTP method (GET, POST) used to submit the form-data?
action method value
<form action="script.php" method="post"> ... </form>
Which CSS property allows to add shadow to boxes?
background-image box-shadow border-radius
#id {
  background-color: #bbfeda;
  box-shadow: 11px 11px 5px #7878da;
Which function removes the first element from an array?
pop() push() shift()
var fruits = ["apple", "apricot", "banana"];
alert(fruits.length);           // 2
Indicate the function that can be used to check if a PHP extension is instaled.
function() filetype() extension_loaded()
if(extension_loaded("PDO") === true) echo "PDO is available."
While loops

Last accessed pages

  1. Zodiac Signs JavaScript code (6378)
  2. PHP Method Chaining (2201)
  3. Simple Admin Login PHP Script (5732)
  4. Display data from PHP Array, or MySQL in HTML table (19000)
  5. PHP getElementById and getElementsByTagName (38292)

Popular pages this month

  1. Courses Web: PHP-MySQL JavaScript Node.js Ajax HTML CSS (117)
  2. PHP-MySQL free course, online tutorials PHP MySQL code (66)
  3. Read Excel file data in PHP - PhpExcelReader (66)
  4. Register and show online users and visitors (58)
  5. JavaScript Course - Free lessons (50)