JavaScript Number Pattern 51

Posted in JavaScript Tutorial

Updated on Jan 10, 2024

By Mari Selvan

👁️ 214 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

JavaScript Number Pattern 51

Here`s a program that prints the above number pattern using JavaScript Programming:

example.html

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<!DOCTYPE html>
<html>
 <head>
  <style>
   div{
    display: inline-block;
    text-align: center;
    width: 22px;
   }
  </style>
 </head>
<body>

<script>
var i, k = 1, m = 1;
for(i=1; i<=5; i++)
{
 m = k + i - 1;
 for(j=1; j<=i; j++)
 {
  if(i % 2 == 1)
   document.write("<div>"+ k +"</div>");
  else
   document.write("<div>"+ m-- +"</div>");
  k++;
 }
 document.write("<br>");
}

</script>
</body>
</html>

💻 Testing the Program

When you run the above program, it will print the following output:

Output

1
3  2
4  5  6
10 9  8  7
11 12 13 14 15

🧠 How the Program Works

Let's break down the logic behind the code:

var i, k = 1, m = 1;: This line declares three variables: i, k, and m. k and m are initialized to 1.
for(i=1; i<=5; i++): This is the outer loop that iterates from 1 to 5. It uses the variable i to keep track of the current iteration.
Inside the outer loop, we have:
1. m = k + i - 1;: This line calculates the value of m for the current iteration of the outer loop.
2. for(j=1; j<=i; j++): This is an inner loop that iterates from 1 to the value of i. It uses the variable j to keep track of the inner loop's current iteration.
Inside the inner loop, we have a conditional statement:
1. if(i % 2 == 1): This checks if the value of i is odd.
2. If the above condition is true, it executes the following line: document.write("<div>"+ k +"</div>");. This line writes a <div> element to the document containing the value of k.
3. If the condition is false (i.e., i is even), it executes the following line: document.write("<div>"+ m-- +"</div>");. This line writes a <div> element to the document containing the value of m, and then decrements m.
4. Regardless of whether i is odd or even, the variable k is incremented with each iteration of the inner loop.
After the inner loop completes, the following line is executed: document.write("<br>");. This writes a line break (<br>) to the document, creating a new line after each set of <div> elements.
The outer loop continues to the next iteration until i reaches 5.

💯 Tips for Enhancement:

Explore the versatility of this pattern by adjusting its parameters. Whether you increase or decrease the size, tweak the spacing, or modify the characters used, each change opens up a world of possibilities, allowing you to customize and create your unique visual effects.

✔ Conclusion:

Creating visually appealing patterns is not only a fun endeavour but also a great way to enhance your programming or design skills. We hope this tutorial has inspired you to explore the world of creative coding. Share your creations with us, and let your imagination run wild!

🤗 Closing Call-to-Action:

We'd love to see your unique interpretations of the number pattern. Share your creations in the comments below, and don't hesitate to reach out if you have any questions or suggestions for future tutorials. Happy coding!