JavaScript Style Guide Summary

This style guide provides best practices for writing clean, readable, and maintainable JavaScript code. Following these guidelines helps ensure consistency across projects and improves collaboration among developers.

Key Concepts

1. Code Formatting

• Indentation: Use 2 spaces for indentation.
• Line Length: Keep lines under 80 characters.
• Spacing: Use spaces around operators and after commas for better readability.

javascript
// Good
let sum = a + b;

// Bad
let sum=a+b;

2. Variable Declarations

• Use const for variables that won’t change, and let for those that will.
• Avoid using var to prevent scope issues.

javascript
const PI = 3.14;
let radius = 5;

3. Naming Conventions

• Use camelCase for variable and function names.
• Use PascalCase for class names.
• Use descriptive names for variables and functions.

javascript
// Good
function calculateArea(radius) { /*...*/ }
class Circle { /*...*/ }

// Bad
function ca(r) { /*...*/ }

4. Comments

• Use comments to explain complex code but avoid obvious comments.
• Use multi-line comments for larger explanations.

javascript
// This function calculates the area of a circle
function calculateArea(radius) {
    return Math.PI * radius * radius; // Area formula
}

5. Control Structures

• Always use braces {} for blocks, even if they contain a single statement.
• Use meaningful conditionals.

javascript
// Good
if (isActive) {
    activate();
}

// Bad
if (isActive) activate();

6. Function Definitions

• Prefer function expressions over function declarations when possible.
• Keep functions small and focused on a single task.

javascript
// Good
const add = (a, b) => a + b;

// Bad
function add(a, b) {
    return a + b;
}

7. Error Handling

• Use try...catch for error handling.
• Provide meaningful error messages.

javascript
try {
    riskyFunction();
} catch (error) {
    console.error('Error occurred:', error.message);
}

Conclusion

Following this style guide will help you write better JavaScript code that is easier to read, maintain, and collaborate on. Consistency in coding style enhances the overall quality of the codebase and reduces the likelihood of errors.