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While Loop In TypeScript

Posted by Richa Garg Articles | TypeScript October 26, 2012
In this article I will explain how to use a while loop in TypeScript.
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Introduction

Today I am going to explain how to use a while loop in TypeScript. I give an example of using the while loop to find the reverse of any number. For example if I enter the number 1234 then it will give the result as 4321. The syntax of the while loop is as:

Initialization;
While (Condition)
{
  // Statements
Increment/Decrement
}

Now to use the while loop in TypeScript use the following.

Step 1

Open Visual Studio 2012 and click "File" -> "New" -> "Project...".

Step 2

A window is shown. In it select HTML Application for TypeScript under the Visual C# template and give the anme of your applicatiuon that you want to give then click ok.

Step 3

In this application there are three files; they are app.ts (TypeScript file), app.js (JavaScript file) and the defult.htm (HTML file). Open the app.ts file.

Step 4

Write the following TypeScript code in the app.ts file:

class Example_WhileLoop {

    constructor () {

    }

    Reverse() {

        var n: number;

        var s = 0;

        n = parseInt(prompt("Enter any Number"));

        var temp = n;

        while (temp != 0) {

            s = s * 10;

            s = s + temp % 10;

            temp = Math.floor(temp / 10);

        }

        var span = document.createElement("span");

        span.innerText = "Reverse Number is->" + s;

        document.body.appendChild(span);

    }

}

window.onload = () =>

{

    var greeter = new Example_WhileLoop();

    greeter.Reverse();

};

Step 5

Write the following code in the app.js file:

var Example_WhileLoop = (function () {

    function Example_WhileLoop() {

    }

    Example_WhileLoop.prototype.Reverse = function () {

        var n;

        var s = 0;

        n = parseInt(prompt("Enter any Number"));

        var temp = n;

        while (temp != 0) {

            s = s * 10;

            s = s + temp % 10;

            temp = Math.floor(temp / 10);

        }

        var span = document.createElement("span");

        span.innerText = "Reverse Number is->" + s;

        document.body.appendChild(span);

    };

    return Example_WhileLoop;

})();

window.onload = function () {

    var greeter = new Example_WhileLoop();

    greeter.Reverse();

};

Step 6

Write the following code in the default.htm file:
 

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">

<head>

    <meta charset="utf-8" />

    <title>While Loop Example</title>

    <link rel="stylesheet" href="app.css" type="text/css" />

    <script src="app.js"></script>

</head>

<body>

    <h1>While Loop Example</h1>

    <div id="content"/>

</body>

</html>


Step 7


Now run the application and the output will be like:

While-loop-output-in-typescript.jpg

When I click the ok button then the result is displayed as:

Display-reverse-of-a-number-in-typescript.jpg
Summary

In this article I explained how to use a while loop in TypeScript.

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