10 JavaScript Best Practices For New Developers

10 JavaScript Best Practices For New Developers

10 JavaScript Best Practices For New Developers: Best Practices of Variable, Objects, Array, Destructuring, Strings, Arrow Functions, Modules, Properties, Exponentiation Operator, Comparison Operators

Every programming language has a Style Guide of its own. A style guide is an opinionated guide of programming conventions, style, and best practices for a team or project.

JavaScript also has a worldwide acknowledged style guide which is made by Air BNB. This style guide teaches us the good practices and bad practices of JavaScript. But most new developers are not aware of it. That’s why I’m writing this post about 10 best practices of JavaScript. Hope you will enjoy it.

  1. Best Practices of Variable
  2. Objects
  3. Array
  4. Destructuring
  5. Strings
  6. Arrow Functions
  7. Modules
  8. Properties
  9. Exponentiation Operator
  10. Comparison Operators

1) Best Practices of Variable

In JavaScript, you can declare a variable using three keywords. These are var, const, and let. Now you might be thinking, “What is the difference between these keywords? These do the same thing which is declaring a variable.” No, they are not the same. Let’s see this example below…

// bad
var a = 1;
var b = 2;

// good
const a = 1;
const b = 2;
// good (But not in all cases)
let a = 1;
let b = 2;

In modern JavaScript, we don’t use var. Rather we use let and const. The only difference between let and const is, you can change the value of a variable which has declared using let but you can’t change the value of a variable which has declared using const.

2) Objects

Some developers use _new _keyword during the declaration of an object. You can easily differentiate between good practices and bad practices of Objects through this example…

// bad
const item = new Object();

// good
const item = {};

An Object in JavaScript shouldn’t be declared with _new _keyword.

3) Array

Some weird developers use _new _keyword during the declaration of an array. I don’t have any idea why they do that. You can easily differentiate between good practices and bad practices of Array through this example…

// bad
const items = new Array();

// good
const items = [];

An Array in JavaScript shouldn’t be declared with _new _keyword. Another bad practice that most developers do is the direct assignment to add items to an array. Let me show an example.

const someStack = [];

// bad
someStack[someStack.length] = 'abracadabra';
// good
someStack.push('abracadabra');

So from now, use push instead of direct assignment to add items to an array.

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