7 JavaScript Best Practices

JavaScript is by far the most popular programming languages.Learning its best practices will advance your career.  In this Blog, you’ll learn about some incredibly helpful JavaScript features that will enhance your skills.

Let’s get started!

1. Use strict mode

Use ‘use strict’ keywords at the beginning of your JavaScript code for strict coding standards and identify any issues early. Using it allows you to avoid undeclared variables, which improves code quality.

"use strict";
x = 5; // this will cause an error in strict mode

2. Use ‘let’ and `const`

When declaring variables, useletandconst instead of var. Useletif you know the value of a variable and const if you don’t.

let greetings = "Hello World!";
const pi = 3.14;

3. Use `===` instead of `==`

Generally, if you use (===) with different types of values, you won’t get unexpected results. Using (===) is recommended.

const x = 10;
const y = "10";

// Using == operator (type coercion allowed)
console.log(x == y); // true

// Using === operator (type coercion not allowed)
console.log(x === y); // false

4. Write modular code

It will be simpler to test and maintain your code if you divide it into manageable, and reusable functions.

function add(a, b) {
return a + b;
}
function subtract(a, b) {
return a - b;
}
console.log(add(1, 2)); // 3
console.log(subtract(1, 2)); // -1

5. Use arrow functions

Arrow functions were added to JavaScript in ES6. Use the arrow functions, ‘() =>’, for comprehensible and readable JavaScript functions.

const add = (a, b) => a + b;

const subtract = (a, b) => a - b;

console.log(add(1, 2)); // 3
console.log(subtract(1, 2)); // -1

6. Template literals

Through the use of template literals, variables and expressions can be easily interpolated into strings. The method is called “string interpolation.”

let name = "John Doe";
console.log(`Hello ${name}!`); // Hello John Doe!

7. Object destructuring

Using the JavaScript Object Destructuring expression, you can access the information contained in objects such as arrays, objects, and maps and assign it to new variables.

let person = { name: "John Doe", age: 30 };

let { name, age } = person;

console.log(name, age); // John Doe 30

Thank you for reading 🙏