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Dipak Ahirav
Dipak Ahirav

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Top 20 JavaScript Tricks and Tips for Every Developer πŸš€

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;
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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;
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3. Template Literals πŸ“œ

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

Example:

const name = 'John';
const greeting = `Hello, ${name}!`;
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4. Default Parameters πŸ› οΈ

Set default values for function parameters to avoid undefined errors.

Example:

function greet(name = 'Guest') {
  return `Hello, ${name}!`;
}
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5. Arrow Functions 🎯

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

Example:

const add = (a, b) => a + b;
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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 };
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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);
}
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8. Short-Circuit Evaluation && and || πŸ› οΈ

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';
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9. Object Property Shorthand πŸš€

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 };
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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;
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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';
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12. Array Methods: map(), filter(), reduce() πŸ› οΈ

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);
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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));
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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);
  }
}
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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));
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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));
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15. Using for...of for Iteration πŸš€

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);
}
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16. Cloning Objects and Arrays πŸ› οΈ

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];
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17. Dynamic Property Names 🌟

Use computed property names to dynamically set object properties.

Example:

const propName = 'age';
const person = {
  name: 'John',
  [propName]: 30
};
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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);
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19. String Methods: includes(), startsWith(), endsWith() πŸ“œ

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
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20. Using console Effectively for Debugging πŸ› οΈ

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();
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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.

πŸ‘‰ Introduction to JavaScript: Your First Steps in Coding

Support My Work

If you enjoy my content and want to support my work, consider buying me a coffee! Your support helps me continue creating valuable content for the developer community.

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 πŸš€ Read
7 8 Exciting New JavaScript Concepts You Need to Know Read
8 Top 7 Tips for Managing State in JavaScript Applications Read
9 πŸ”’ 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)

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skamansam profile image
Samuel

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.

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dipakahirav profile image
Dipak Ahirav

Thanks @skamansam

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medison_chikuta_7922e2fec profile image
Medison Chikuta

Hey, a new to code and am learning JavaScript.

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dipakahirav profile image
Dipak Ahirav

Great to hear you, All the best .

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ashleyd480 profile image
Ashley D

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!
πŸš€

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dipakahirav profile image
Dipak Ahirav

Thank you so much for kind words. Means alot.

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moglimanani profile image
manimaran

Great articles. Simpler and neat explanation.

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dipakahirav profile image
Dipak Ahirav

Thanks @moglimanani

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kin7777 profile image
kince marando • Edited

Great insight links , and eye opening for junior and Senior develops.!
Kindly thanks

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dipakahirav profile image
Dipak Ahirav

Your Welcome @kin7777

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marmeden profile image
eneasmarin

Great one. So satisfying to realize that I am using most of them, but still some good ones to include in my work

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tomasdevs profile image
Tomas Stveracek

Great short summary!

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dipakahirav profile image
Dipak Ahirav

Thanks @tomasdevs

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syedmuhammadaliraza profile image
Syed Muhammad Ali Raza

informative article

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michalispapamichael profile image
Michalis Papamichael

informative article

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dipakahirav profile image
Dipak Ahirav
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renterra profile image
Renterra

Cool!

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