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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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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