Top JavaScript Best Practices and Standards to Know

Here are some best practices and standards for writing JavaScript that you may want to consider:

1. Use strict mode

Strict mode is a way to opt in to a restricted variant of JavaScript. Strict mode makes it easier to write "secure" JavaScript by eliminating some of the "sloppier" parts of the language, and it also simplifies debugging. To use strict mode, include the string "use strict" at the top of your JavaScript file or at the top of a function.

2. Use semicolons

It is a good practice to use semicolons at the end of each statement in your JavaScript code. This helps to prevent syntax errors and can make your code more readable.

3. Use const and let instead of var

In modern JavaScript, it is generally recommended to use the const and let keywords instead of var when declaring variables. const is used for values that cannot be reassigned, and let is used for values that can be reassigned. This helps to prevent accidental reassignments and can make your code more predictable.

4. Use arrow functions

Arrow functions are a shorthand syntax for writing function expressions in JavaScript. They are often more concise and easier to read than traditional function expressions, and they also have some unique features such as lexical this binding.

5. Use template literals 

Template literals are a way to create strings in JavaScript that can span multiple lines and include expressions that are evaluated at runtime. They are typically easier to read and write than traditional string concatenation.

6. Use modern syntax and features

JavaScript has evolved significantly over the years, and there are many newer syntax and features that can make your code more concise and expressive. Consider using modern language features such as classes, destructuring, and async/await to write more elegant and efficient code.

7. Follow naming conventions

It is a good practice to follow a consistent naming convention throughout your code. This can help to make your code more readable and easier to understand. Some common conventions include camelCase for variables and functions, and PascalCase for classes and constants.

8. Use comments

Comments are a way to add human-readable explanations to your code. They can help to clarify the purpose of your code and make it easier for others (or yourself) to understand. Use comments sparingly and make sure they are up-to-date and accurate.

9. Use linting tools

Linting tools are programs that can analyze your code and check for potential errors or style issues. By using a linting tool, you can catch mistakes early and ensure that your code adheres to a consistent style guide.

10. Write testable code

Writing code that is easy to test can help to ensure that your code is correct and working as intended. Consider writing code in small, isolated units that can be tested independently, and use tools such as unit tests to validate your code.