JavaScript Best Practices to Write Better & Efficient Code
Following best practices when writing JavaScript code can help create more efficient, scalable, maintainable, and secure applications. These are must follow coding practices for javascript devs.
Avoid global variables or minimize the use of global variables. Use local variables instead or use closures. Global variables can lead to naming collisions and make it difficult to track the flow of data in the code.
Variables used in a function should be declared as local variables. Local variables must be declared with the var, the let, or the const keyword, otherwise they will become global variables.
Always declare variables with the let or const keyword. This prevents unintended variable hoisting and helps to avoid naming collisions. Use const for constants. Use the const keyword for variables that will not be reassigned. This ensures that the value of the variable does not change accidentally.
Use meaningful variable and function names. Use descriptive names for variables and functions to make the code more readable and maintainable.
Use strict mode because it will not allow undeclared variables. It also helps to avoid common mistakes and enforce better coding practices.
Declare variables at the beginning. Initialize variables when you declare them. It helps in cleaner code, providing a single place to initialize variables and avoiding undefined values.
Declare Objects and arrays with const. This will prevent accidental change of type for arrays and objects. This is why we declare arrays and objects using const. And this is a good interview question for JavaScript developers. Interviewer can ask you that ‘why do we declare arrays and objects with const?’ So keep this in mind.
Use strict equality operator (===) Instead of Equality operator (==) in comparisons. The comparison operator always converts (to matching types) before comparison. The strict equality operator forces comparison of values and type.
Use parameter defaults for functions. If a function is called with a missing argument, the value of the missing argument is set to undefined. Undefined values can break the code. It is good practice to assign default values to arguments.
Always end switch statements with a default. Even if you think there is no need for it.
Always treat numbers, strings, or booleans as primitive values. Not as objects. Declaring these types as objects, slows down code execution, and produces unwanted side effects.
Don’t use eval function. The eval() function is used to run text or string as code. It should not be used. It allows arbitrary code to be run. So it can be a security risk to use eval function.
Avoid nested callbacks as it can make your code difficult to read and maintain. Use promises or async/await to handle asynchronous operations. Async/await is better.
Use arrow functions. JavaScript arrow functions are a concise way to write functions in JavaScript. Use arrow functions to write concise and readable code. They also help to avoid problems with ‘this’ binding.
Use linter such as ‘esList’ and code formatter such as ‘Prettier’. Refactor code.
*Callback Functions*
https://youtu.be/u8Q_A9OXEIk
*Callback, Callback Hell, Promises, Async/Await*
https://youtu.be/IDn16Y8A3Ww
*Closures in JavaScript*
https://youtu.be/NAtVWJCmJyg
*Currying in JavaScript*
https://youtu.be/YuIa6WInFFg
Have a look at *airbnb javascript style guide* . It has brilliant recommendations to write better code.
https://github.com/airbnb/javascript
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