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Top 8 JavaScript Patterns with Explanations and Code Examples

byAJ TECH BLOG -

 

Introduction to Patterns in Programming

Patterns in programming refer to the structured arrangement of symbols, numbers, or characters, often displayed in a geometric or repetitive form. These patterns are commonly used to practice and demonstrate programming concepts, especially loops and nested loops.

Building patterns is a popular exercise for beginners as it helps them understand the flow of control structures like for, while, and do-while loops. It also enhances problem-solving skills by encouraging logical thinking and the ability to break down problems into smaller, manageable parts.

Why Learn Pattern Programming?

  1. Strengthens Logical Thinking: Patterns require analyzing how to arrange characters or numbers in a specific sequence. This sharpens your logic and reasoning skills.
  2. Improves Control Flow Understanding: Patterns are a great way to practice loops (for, while, do-while) and conditional statements (if, else). This helps you gain better control over these fundamental programming concepts.
  3. Enhances Problem-Solving Skills: Writing pattern programs can improve your ability to solve problems by breaking them down into smaller tasks.
  4. Prepares for Coding Interviews: Many coding interviews include pattern-based questions to assess your understanding of loops and logic.


Understanding Patterns in JavaScript

Patterns are essential in programming to solve common problems efficiently. In JavaScript, patterns often involve manipulating loops and conditional statements to create various outputs. Learning patterns not only sharpens your problem-solving skills but also prepares you for coding interviews.

Before going to topic The open source code for executing patterns in browser. Here is the code. 



<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <title>Pattern Generator</title>

  <style>

    body { font-family: Arial, sans-serif; text-align: center; }

    textarea { width: 100%; height: 200px; }

  </style>

</head>

<body>

  <h2>JavaScript Pattern Generator</h2>

  

  <button onclick="generatePattern()">Generate Pattern</button>

  <pre id="output"></pre>


  <script>

    function generatePattern() {


// starting point to change the code  

      const n = 5

      let pattern = "";

      for (let i = 1; i <= 5; i++) {

        pattern += "* ".repeat(i) + "\n";

//  Ending point to change code.. 

      }

      document.getElementById('output').textContent = pattern;

    }

  </script>

</body>

</html>



In this article, we'll explore 5 popular patterns in JavaScript, along with code examples and explanations. This is the part 1 for this article we may get more articles using javascript and c# and pythons etc.,  Let's dive in!

1. Right-Angled Triangle Pattern

The right-angled triangle is one of the most basic patterns, where each row contains an increasing number of stars (*).

Pattern:


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

JavaScript Code:


for (let i = 1; i <= 5; i++) {
  console.log('*'.repeat(i));
}

Explanation:

  • The loop runs 5 times, where each iteration prints a line with an increasing number of stars.
  • The .repeat() method is used to print the star character multiple times.

Explore more JavaScript patterns on AJ Tech Blog.

2. Inverted Right-Angled Triangle Pattern

This pattern is the reverse of the right-angled triangle.

Pattern:


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

JavaScript Code:


for (let i = 5; i >= 1; i--) {
  console.log('*'.repeat(i));
}

Explanation:

  • The loop starts from 5 and decrements down to 1.
  • The .repeat() method is used to print stars based on the current row number.

Check out more coding examples on AJ Tech Blog.

3. Pyramid Pattern

A pyramid pattern aligns stars in a symmetrical triangular form.

Pattern:


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

JavaScript Code:


for (let i = 1; i <= 5; i++) {
  console.log(' '.repeat(5 - i) + '*'.repeat(2 * i - 1));
}

Explanation:

  • The loop controls the number of rows.
  • Use .repeat() for spaces and stars.
  • The number of stars in each row is 2 * row - 1.

4. Diamond Pattern

This pattern forms a diamond shape by combining an upward and downward pyramid.

Pattern:


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

JavaScript Code:


let n = 5;
for (let i = 1; i <= n; i++) {
  console.log(' '.repeat(n - i) + '*'.repeat(2 * i - 1));
}
for (let i = n - 1; i >= 1; i--) {
  console.log(' '.repeat(n - i) + '*'.repeat(2 * i - 1));
}

Explanation:

  • The first loop creates the upper pyramid.
  • The second loop creates the lower inverted pyramid.

5. Number Triangle Pattern

This pattern uses numbers instead of stars.

Pattern:


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

JavaScript Code:


for (let i = 1; i <= 5; i++) {
  let row = '';
  for (let j = 1; j <= i; j++) {
    row += j;
  }
  console.log(row);
}

Explanation:

  • The outer loop controls the rows.
  • The inner loop appends numbers to the row.

For more JavaScript tips, visit AJ Tech Blog.

Can you solve? 

Can you solve this pattern try once.. 

1
0  2
0  0  3
0  0  0  4
0  0  0  0  5

try once.. And the code and explanation will be in the next article.. If you want this patterns code in other programming languages? Tell me in comment section. 

Conclusion

Patterns are a fantastic way to practice JavaScript logic and improve coding efficiency. Try experimenting with these patterns to boost your problem-solving skills. For more in-depth JavaScript tutorials, head over to AJ Tech Blog.

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1 Comments

Thnk you for your feedback

  1. AJ TECH BLOG14 November 2024 at 08:22

    Feel free to ask your doubts on this topics and let me know which type of patterns to solve

    ReplyDelete
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