JavaScript Best Practices

JavaScript best practices, aimed at making your code cleaner, safer, and easier to maintain.

1. Use let and const instead of var

• var is function-scoped and can cause unexpected bugs.
• let is block-scoped and good for variables that change.
• const is block-scoped and for variables that do not change (or shouldn’t be reassigned).

2. Use strict equality ===

• Avoid == because it does type coercion and can give unexpected results.

3. Write clear, meaningful names

• Use descriptive variable and function names.

4. Keep functions small and do one thing

• Makes your code easier to debug and test.

5. Avoid polluting the global scope

• Wrap your code in modules or functions.
• This prevents name collisions.

6. Handle errors properly

• Use try...catch for code that might fail (like API calls).

7. Use comments wisely

• Comments should explain why, not what (the code already tells what).

8. Use modern syntax

• Use arrow functions, template literals, destructuring, and default parameters.

9. Avoid deep nesting

• Too many nested if / for blocks make code hard to read.
• Use early returns.

10. Format your code

• Consistent indentation, spacing, and semicolons improve readability.
• Use tools like Prettier or ESLint.