Tutorials

JavaScript Star Pattern 10

Posted in JavaScript Tutorial

Updated on Jan 10, 2024

By Mari Selvan

👁️ 968 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

JavaScript Star Pattern 10

Here`s a program that prints the above star 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=i; j<5; j++)
  document.write("&nbsp;&nbsp;");
 for(k=1; k<i*2; k++)
   document.write("*");
 document.write("<br>");
}
// Second Part
for(i=4; i>=1; i--)
{
 for(j=5; j>i; j--)
  document.write("&nbsp;&nbsp;");
 for(k=1; k<i*2; k++)
  document.write("*");
 document.write("<br>");
}
</script>
</body>
</html>

💻 Testing the Program

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

Output

    *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *

🧠 How the Program Works

Let's break down the logic behind the code:

Variable Declarations: The variables i, j, and k are declared to be used in loops.
First Part (Upper Pyramid): This section generates the upper pyramid pattern.
1. The outer for loop (for(i = 1; i <= 5; i++)) iterates over the rows of the pyramid, starting from 1 and going up to 5.
2. The nested for loop (for(j = i; j < 5; j++)) is responsible for printing the spaces before the stars. The number of spaces decreases as i increases.
3. The second nested for loop (for(k = 1; k < i * 2; k++)) prints the stars. The number of stars in each row is i * 2 - 1.
4. After printing the spaces and stars, document.write("<br>"); moves the cursor to the next line to start the next row.
Second Part (Lower Pyramid): This section generates the lower pyramid pattern.
1. The outer for loop (for(i = 4; i >= 1; i--)) iterates over the rows of the lower pyramid, starting from 4 and going down to 1.
2. The nested for loop (for(j = 5; j > i; j--)) prints the spaces before the stars. The number of spaces increases as i decreases.
3. The second nested for loop (for(k = 1; k < i * 2; k++)) prints the stars. The number of stars in each row is i * 2 - 1.
4. After printing the spaces and stars, document.write("<br>"); moves the cursor to the next line to start the next row.

💯 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 star 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!