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Display Number's Without Loop In TypeScript

Introduction

 
A recursive function is a function that calls itself, in other words, multiple times. The advantage of using recursion is code reusability.  A recursive function must have at least one exit condition that can be satisfied.
 
In the following example, we will display 100 numbers without a loop but using a recursive function instead.
 

Complete Program

 
app.ts
  1. class Number_Without_Loop  
  2. {  
  3.  Display_Number(num: number)  
  4.  {  
  5.   if (num <= 100)  
  6.   {  
  7.    var span = document.createElement("span");  
  8.    span.style.color = "blue";  
  9.    span.innerText = num + ",";  
  10.    document.body.appendChild(span);  
  11.    this.Display_Number(num + 1);  
  12.   }  
  13.  }  
  14. }  
  15. window.onload = () =>  
  16.  {  
  17.   var obj = new Number_Without_Loop();  
  18.   obj.Display_Number(1);  
  19.  };  
default.htm
  1. <!DOCTYPE html>  
  2. <html lang="en"  
  3.     xmlns="http://www.w3.org/1999/xhtml">  
  4.     <head>  
  5.         <meta charset="utf-8" />  
  6.         <title>TypeScript HTML App</title>  
  7.         <link rel="stylesheet" href="app.css" type="text/css" />  
  8.         <script src="app.js"></script>  
  9.         <style type="text/css"></style>  
  10.     </head>  
  11.     <body>  
  12.         <h3>Display 100 Number Without Loop In TypeScript</h3>  
  13.         <p></p>  
  14.     </body>  
  15. </html>  
app.js
  1. var Number_Without_Loop = (function() {  
  2.  function Number_Without_Loop() {}  
  3.  Number_Without_Loop.prototype.Display_Number = function(num) {  
  4.   if (num <= 100) {  
  5.    var span = document.createElement("span");  
  6.    span.style.color = "blue";  
  7.    span.innerText = num + ",";  
  8.    document.body.appendChild(span);  
  9.    this.Display_Number(num + 1);  
  10.   }  
  11.  };  
  12.  return Number_Without_Loop;  
  13. })();  
  14. window.onload = function() {  
  15.  var obj = new Number_Without_Loop();  
  16.  obj.Display_Number(1);  
  17. };  
Output 
 
Result.jpg
 
For more information, download the attached sample application.


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