JavaScript Loop While


Loops and iterations

JavaScript loops are offering a quick and easy way to do something repeatedly. It is used to run block of code over and over again - until a certain condition is met. When we talk about iteration or iterating an array, it means the same as looping. JavaScript has a number of options to run a block of code repeatedly, among them we find while, do while, for and for-in and others as well.


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While statement

The while statement is creating a loop that is executing a specified statement. It will execute as long as the test condition evaluates to true. Before starting to execute the statement the condition is evaluated.

Usually we call the while loop a control flow statement that allows code to be executed repeatedly based on a given condition. We can think of the while loop as a repeating if statement.

JS JavaScript - While statement

var x  = 0;
 
while (x< 9) {
  x++;
}
console.log(x);
// Correct output: 9

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A Fibonacci series

JS JavaScript - A Fibonacci series

//Fibonacci series
var x = 0, y = 1, z;
 
while(x < 60) {
  z = x + y;
  x = y;
  y = z;
}
 
//The expected result:
// 0
// 1
// 1
// 2
// 3
// 5
// 8
// 13
// 21
// 34
// 55

Do..while statement

The do...while statement is almost identical to the while loop. The main difference is that the condition is checked first after the block of code gets executed. As a consequence of that, the code is running once before checking the condition and specified statement is always executing at least once.

JS JavaScript - Do..while statement

var result = "";
var x = 0;
 
do {
  x = x + 2;
  result = result + x;
} while (x < 25);
 
alert(result);
// Output: "2468101214161820222426"

Learn more about JavaScript Array Iteration
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JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.


The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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