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) {
// 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);
// Output: "2468101214161820222426"

Learn more about JavaScript Array Iteration

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JS JavaScript: Let

Let is a keyword that is used to declare a variable.

You should use let instead of var when declaring a variable.

One of the most important things is that you should try to keep things simple!<....

JS JavaScript: Strict Mode

The strict context prevents some actions and throws more exceptions. Strict mode changes previously accepted "bad syntax" into errors. Strict mode will for example prevent using undeclared variables. The "use strict" directive was new in ECMAScript version 5.

JS JavaScript: Var

Var is a keyword that is used to declare a variable.

But, you should NOT use var, use let when declaring a variable.

One of the most important things is that you should try to keep things simple!

JS JavaScript: Conditions

A condition is an expression that evaluates whether something is true or false. Conditions are very much used. Usually the code should execute one way if the condition is true and another way if the condition is false.


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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