Dipak Ahirav

Posted on Jul 29 • Edited on Sep 18

Top 20 JavaScript Tricks and Tips for Every Developer 🚀

#javascript #webdev #beginners #learning

JavaScript is a versatile and powerful language, but it can also be tricky to master. Here are 20 JavaScript tricks and tips that every developer should know to write cleaner, more efficient code and improve their development workflow. 🌟

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1. Use `let` and `const` Instead of `var` 🚫

Avoid using var to declare variables. Instead, use let and const to ensure block-scoping and avoid hoisting issues.

Example:

let name = 'John';
const age = 30;

2. Destructuring Assignment 🌟

Destructuring allows you to extract values from arrays or properties from objects into distinct variables.

Example:

const person = { name: 'Jane', age: 25 };
const { name, age } = person;

const numbers = [1, 2, 3];
const [first, second] = numbers;

3. Template Literals 📜

Template literals provide an easy way to interpolate variables and expressions into strings.

Example:

const name = 'John';
const greeting = `Hello, ${name}!`;

4. Default Parameters 🛠️

Set default values for function parameters to avoid undefined errors.

Example:

function greet(name = 'Guest') {
  return `Hello, ${name}!`;
}

5. Arrow Functions 🎯

Arrow functions provide a concise syntax and lexically bind the this value.

Example:

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

6. Spread Operator `...` 🌐

The spread operator allows you to expand elements of an iterable (like an array) or properties of an object.

Example:

const arr1 = [1, 2, 3];
const arr2 = [...arr1, 4, 5];

const obj1 = { name: 'John' };
const obj2 = { ...obj1, age: 30 };

7. Rest Parameters `...` 🌟

Rest parameters allow you to represent an indefinite number of arguments as an array.

Example:

function sum(...numbers) {
  return numbers.reduce((total, num) => total + num, 0);
}

8. Short-Circuit Evaluation && and || 🛠️

Use short-circuit evaluation for conditional expressions and default values.

Example:

const user = { name: 'John' };
const name = user.name || 'Guest';

const isAdmin = user.isAdmin && 'Admin';

9. Object Property Shorthand 🚀

Use shorthand syntax to create objects when the property name and variable name are the same.

Example:

const name = 'John';
const age = 30;
const person = { name, age };

10. Optional Chaining `?.` 🌐

Optional chaining allows you to safely access deeply nested properties without having to check if each reference is valid.

Example:

const user = { name: 'John', address: { city: 'New York' } };
const city = user.address?.city;

11. Nullish Coalescing `??` 🌟

Nullish coalescing (??) provides a way to return the right-hand operand when the left-hand operand is null or undefined.

Example:

const user = { name: 'John' };
const name = user.name ?? 'Guest';

12. Array Methods: map(), filter(), reduce() 🛠️

Use array methods like map(), filter(), and reduce() to perform common operations on arrays in a functional way.

Example:

const numbers = [1, 2, 3, 4, 5];

const doubled = numbers.map(num => num * 2);
const evens = numbers.filter(num => num % 2 === 0);
const sum = numbers.reduce((total, num) => total + num, 0);

13. Promise Chaining and Async/Await 🎯

Handle asynchronous operations using Promises and the async/await syntax for cleaner, more readable code.

Example with Promises:

fetch('https://api.example.com/data')
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error('Error:', error));

Example with Async/Await:

async function fetchData() {
  try {
    const response = await fetch('https://api.example.com/data');
    const data = await response.json();
    console.log(data);
  } catch (error) {
    console.error('Error:', error);
  }
}

14. Debouncing and Throttling 🌟

Optimize performance by debouncing and throttling functions that are called frequently, such as during scroll or resize events.

Debouncing Example:

function debounce(func, delay) {
  let timeoutId;
  return function(...args) {
    clearTimeout(timeoutId);
    timeoutId = setTimeout(() => func.apply(this, args), delay);
  };
}

window.addEventListener('resize', debounce(() => {
  console.log('Resized');
}, 300));

Throttling Example:

function throttle(func, limit) {
  let inThrottle;
  return function(...args) {
    if (!inThrottle) {
      func.apply(this, args);
      inThrottle = true;
      setTimeout(() => inThrottle = false, limit);
    }
  };
}

window.addEventListener('scroll', throttle(() => {
  console.log('Scrolled');
}, 300));

15. Using `for...of` for Iteration 🚀

Use the for...of loop for more readable iteration over arrays, strings, and other iterable objects.

Example:

const numbers = [1, 2, 3, 4, 5];

for (const number of numbers) {
  console.log(number);
}

16. Cloning Objects and Arrays 🛠️

Use the spread operator or Object.assign() to clone objects and arrays.

Example:

const original = { name: 'John', age: 30 };
const clone = { ...original };

const arr = [1, 2, 3];
const arrClone = [...arr];

17. Dynamic Property Names 🌟

Use computed property names to dynamically set object properties.

Example:

const propName = 'age';
const person = {
  name: 'John',
  [propName]: 30
};

18. Using `setTimeout` and `setInterval` 🎯

Schedule code execution using setTimeout and setInterval.

Example:

setTimeout(() => {
  console.log('This runs after 2 seconds');
}, 2000);

const intervalId = setInterval(() => {
  console.log('This runs every 3 seconds');
}, 3000);

// To clear the interval
clearInterval(intervalId);

19. String Methods: includes(), startsWith(), endsWith() 📜

Use modern string methods to perform common string operations.

Example:

const str = 'Hello, World!';

console.log(str.includes('World')); // true
console.log(str.startsWith('Hello')); // true
console.log(str.endsWith('!')); // true

20. Using `console` Effectively for Debugging 🛠️

Leverage various console methods for more effective debugging.

Example:

console.log('Simple log');
console.warn('This is a warning');
console.error('This is an error');
console.table([{ name: 'John', age: 30 }, { name: 'Jane', age: 25 }]);
console.group('Group');
console.log('Message 1');
console.log('Message 2');
console.groupEnd();

Start Your JavaScript Journey

If you're new to JavaScript or want a refresher, visit my blog on BuyMeACoffee to get started with the basics.

👉 Introduction to JavaScript: Your First Steps in Coding

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Series Index

Part	Title	Link
1	Ditch Passwords: Add Facial Recognition to Your Website with FACEIO	Read
2	The Ultimate Git Command Cheatsheet	Read
3	Top 12 JavaScript Resources for Learning and Mastery	Read
4	Angular vs. React: A Comprehensive Comparison	Read
5	Top 10 JavaScript Best Practices for Writing Clean Code	Read
6	Top 20 JavaScript Tricks and Tips for Every Developer 🚀	Read
7	8 Exciting New JavaScript Concepts You Need to Know	Read
8	Top 7 Tips for Managing State in JavaScript Applications	Read
9	🔒 Essential Node.js Security Best Practices	Read
10	10 Best Practices for Optimizing Angular Performance	Read
11	Top 10 React Performance Optimization Techniques	Read
12	Top 15 JavaScript Projects to Boost Your Portfolio	Read
13	6 Repositories To Master Node.js	Read
14	Best 6 Repositories To Master Next.js	Read
15	Top 5 JavaScript Libraries for Building Interactive UI	Read
16	Top 3 JavaScript Concepts Every Developer Should Know	Read
17	20 Ways to Improve Node.js Performance at Scale	Read
18	Boost Your Node.js App Performance with Compression Middleware	Read
19	Understanding Dijkstra's Algorithm: A Step-by-Step Guide	Read
20	Understanding NPM and NVM: Essential Tools for Node.js Development	Read

Mastering these JavaScript tricks and tips will help you write cleaner, more efficient code and improve your development workflow. Happy coding! ✨

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Top comments (27)

Samuel • Jul 29

This is a great article! However, you probably shouldn't use the spread operator to clone nested objects. Objects are references so a shallow clone with the spread operator will clone nested refs, not the objects. You should use structuredClone() instead.

Dipak Ahirav • Jul 30

Thanks @skamansam

Medison Chikuta • Jul 30

Hey, a new to code and am learning JavaScript.

Dipak Ahirav • Jul 30

Great to hear you, All the best .

Ashley D • Sep 4

Super helpful @dipakahirav! I like the series you made- you are a wonderful teacher. Currently working on a React JS project myself, and I found these tips really helpful!
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