10 JavaScript Tips Every New Developer Should Know

10 JavaScript Tips Every New Developer Should Know
March 02, 2024

JavaScript is a dynamic programming language that powers the interactivity of most websites and web applications we use daily.

For junior developers or those new to the field, mastering JavaScript can be a journey filled with discovery and growth.

However, the difference between writing code that just works and writing efficient, readable, and maintainable code can be vast.

This blog aims to bridge that gap, transforming regular programmers into expert ones by showcasing practical tips and code snippets.

Let's dive into some common scenarios where the approach of a novice and an expert diverge, offering insights into how you can level up your coding skills.

1. Declaring Variables


var name = "John";
var age = 30;
var isEmployed = true;


const name = "John"; // Use 'const' for variables that won't change
let age = 30; // Use 'let' for variables that might change
const isEmployed = true; // Clearer intent and scope management

Variables are the building blocks of any program. Beginners often use var for declaring variables. Experts, however, prefer const and let for clarity and to avoid scope-related issues.

2. Looping Over Arrays


for (var i = 0; i < myArray.length; i++) {


myArray.forEach(item => console.log(item)); // More concise and functional

Looping is a fundamental concept. While beginners might use traditional for loops, experts leverage modern array methods like forEach for cleaner, more expressive code.

3. Conditional Statements


if (user.age > 18) {
} else {


console.log(user.age > 18 ? "Adult" : "Minor"); // Ternary for simple conditions

Conditional logic is key to decision-making in programming. Instead of lengthy if-else statements, experts often use ternary operators for Shortness.

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4. Function Declarations


function add(a, b) {
 return a + b;


const add = (a, b) => a + b; // Arrow function for shorter syntax

Functions are crucial for code organization. Transitioning from regular function declarations to arrow functions not only shortens the syntax but also solves common issues with this binding.

5. Working with Objects


var person = {
  name: "John",
  age: 30



const person = { name: "John", age: 30 };
const { name, age } = person; // Destructuring for easier data access
console.log(name, age);

Accessing object properties can be streamlined using destructuring, a technique experts use to improve code readability and reduce redundancy.

6. Array Manipulation


var numbers = [1, 2, 3];
var doubledNumbers = [];

for (var i = 0; i < numbers.length; i++) {
  doubledNumbers.push(numbers[i] * 2);


const numbers = [1, 2, 3];
const doubledNumbers = numbers.map(number => number * 2); // More functional

Manipulating arrays is a common task. Experts use methods like map to transform arrays in a more functional programming style, making the code more intuitive.

7. Asynchronous Code


function getData(callback) {
 setTimeout(() => {
 }, 1000);

getData(function(data) {


const getData = () => new Promise(resolve => setTimeout(() => resolve("data"), 1000));
getData().then(data => console.log(data)); // Promises for better async handling

Handling asynchronous operations is a complex but vital skill. Experts use Promises and async/await for better readability and error handling compared to traditional callback functions.

8. Handling Null or Undefined


if (user !== null && user !== undefined && user.name !== undefined) {


console.log(user?.name); // Optional chaining for cleaner checks

Checking for null or undefined values can clutter code. Optional chaining is a tool experts use to simplify these checks, making the code cleaner and more straightforward.

9. Default Function Parameters


function createGreeting(message, name) {
 if (!name) {
  name = "John";
 return message + ", " + name;


const createGreeting = (message, name = "John") => `${message}, ${name}`; // Default params and template literals

Setting default values for function parameters can avoid undefined errors. Experts use default parameters to make functions more robust and easier to understand.

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10. Importing and Exporting Modules


// In file1.js
module.exports = {
 myFunction: function() {...},
 myVariable: 1

// In file2.js
var file1 = require('./file1');


// In file1.js
export const myFunction = () => {...};
export const myVariable = 1;

// In file2.js
import { myFunction, myVariable } from './file1';

Modular code is easier to maintain and test. Experts prefer ES6 module syntax (import/export) over CommonJS (require/module.exports) for its readability and static analysis benefits.

Wrapping Up

Each snippet above showcases a step towards writing better JavaScript. By adopting these expert practices, you'll not only improve your code's quality but also your thinking and problem-solving approach in JavaScript programming.

Whether it's making your code more readable with destructuring and arrow functions, handling asynchronous operations more elegantly with Promises, or simplifying conditions with ternary operators, these tips are invaluable for everyday coding.

Happy coding, and remember, the journey from beginner to expert is a path of continuous learning and improvement!

Resources for You

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