JavaScript Loop For

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.

Learn more about JavaScript Loop While

For Loop

This is probably the most frequently used loop in JavaScript. A for loop is repeating until a specified condition evaluates to false. 

JS JavaScript - For Loop

var animals = ["dog", "cat", "bird", "elephant", "monkey"];
var result = "";
var counter;
for (counter = 0; counter < animals.length; counter++) {
    result += animals[counter] + " : "
alert(result); // Result: dog : cat : bird : elephant : monkey : 

For Loop - A summarizer

Let's try to summarize some integers.

JS JavaScript - For Loop - A summarizer

var summarized = 0;
for (var i = 1; i <= 100; i++) {
   summarized = summarized + i;
alert("summarized = " + summarized);    // => Sum = 5050

For statement - Count the Bumblebees

A Bumblebee counter.

JS JavaScript - For statement - Count the Bumblebees

var counter;
document.write("Let's count some Bumblebees!" + "<br />");
for(counter = 0; counter < 5; counter++)
     document.write("The number of Bumblebees are: " + counter );
     document.write("<br />");
// Result:
// Let's count some Bumblebees!
// The number of Bumblebees are: 0
// The number of Bumblebees are: 1
// The number of Bumblebees are: 2
// The number of Bumblebees are: 3
// The number of Bumblebees are: 4

Learn more about JavaScript Array Iteration

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JS JavaScript: Booleans

Boolean is a primitive data type in JavaScript. Boolean can have only two values, true or false. It is useful in controlling program flow using conditional statements like if..else, switch, while, do..while.

JS JavaScript: Debugging

Searching for bugs and fixing them is called code debugging.

The bugs might be difficult to diagnose and therefore it is important to have a good approach to find and fix the bugs effectively.

JS JavaScript: Developer Tools

Developer Tools are tools that are a part of most modern web browsers.

Every Web Developer should know how to use the tools. The tools do a range of things, from inspecting currently-loaded HTML, CSS and JavaScript to showing which assets the page has requested and how long they took to l....

JS JavaScript: Dates

Date and Time are used in our everyday lives. It is important to understand how to use Date and Time in computer programming. You might have to create a website with a calendar. The application should show relevant times based on the user's current timezone. 

JavaScript offers us a d....


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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Searching for bugs and fixing them is called code debugging. The bugs might be difficult to diagnose and therefore it is important to have a good approach to find and fix the bugs effectively. Bugs in the code might be syntax errors or logical errors. Sometimes nothing happens when the code contains bugs and there is few indications where to search. Modern web browser includes a powerful suite of developer tools. The tools do a range of things...

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