JavaScript Number Pattern 31

Posted in JavaScript Tutorial

Updated on Jan 10, 2024

By Mari Selvan

👁️ 244 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

JavaScript Number Pattern 31

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

example.html

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<!DOCTYPE html>
<html>
<body>

<script>
var i, j, k;
// First Part
for(i=1; i<=5; i++)
{
 for(j=1; j<i*2; j++)
 {
  if(j % 2 == 0)
   document.write("*");
  else
   document.write(i);
 }
 document.write("<br>");
}
// Second Part
for(i=4; i>=1; i--)
{
 for(j=1; j<i*2; j++)
 {
  if(j % 2 == 0)
   document.write("*");
  else
   document.write(i);
 }
 document.write("<br>");
}
</script>
</body>
</html>

💻 Testing the Program

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

Output

1
2*2
3*3*3
4*4*4*4
5*5*5*5*5
4*4*4*4
3*3*3
2*2
1

🧠 How the Program Works

Let's break down the logic behind the code:

First Part:
1. for(i=1; i<=5; i++): This is the outer loop that iterates over the values of i from 1 to 5 (inclusive).
2. for(j=1; j<i*2; j++): This is the inner loop that iterates over the values of j from 1 to i*2 - 1. The value of i*2 determines the number of iterations in each inner loop, and j is used to control whether an asterisk (*) or the value of i should be printed.
3. if(j % 2 == 0): If the current value of j is even (divisible by 2), it prints an asterisk (*).
4. else: If the condition above is not met, it prints the value of i.
5. document.write("<br>");: After each inner loop iteration, a line break (<br>) is written to the document. This moves the output to the next line, creating a pattern effect.
Second Part:
1. for(i=4; i>=1; i--): This is the second outer loop that iterates over the values of i from 4 down to 1 (inclusive).
2. for(j=1; j<i*2; j++): Similar to the first part, this is the inner loop that iterates over the values of j from 1 to i*2 - 1.
3. if(j % 2 == 0): Same as in the first part, if j is even, it prints an asterisk (*).
4. else: If the condition above is not met, it prints the value of i.
5. document.write("<br>");: After each inner loop iteration, a line break (<br>) is written to the document.

💯 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!