JavaScript Best Practices are guidelines for writing clean, maintainable code.
✨ Best Practices:
• Use const/let instead of var
• Use strict mode ('use strict')
• Meaningful variable names
• Avoid global variables
• Use === instead of ==
• Handle errors properly
• Comment complex code
• Use modern ES6+ features
⚠️ Common Pitfalls:
• Forgetting 'this' context
• Callback hell
• Not handling async errors
• Memory leaks
javascript
'use strict';
// Good practices
// 1. Use const/let, not var
const MAX_USERS = 100;
let currentUsers = 0;
// 2. Use === for comparison
if (currentUsers === 0) {
console.log("No users");
}
// 3. Meaningful names
function calculateTotalPrice(items) {
return items.reduce((sum, item) => sum + item.price, 0);
}
const items = [{price: 10}, {price: 20}];
console.log(`Total: ${calculateTotalPrice(items)}`);
// 4. Arrow functions for callbacks
const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map(n => n * 2);
console.log(`Doubled: ${doubled}`);
// 5. Template literals
const name = "Aung Kyaw";
const age = 25;
console.log(`${name} is ${age} years old`);
// 6. Default parameters
function greet(name = "Guest") {
return `Hello, ${name}!`;
}
console.log(greet());You should see
No users Total: 30 Doubled: [2, 4, 6, 8, 10] Aung Kyaw is 25 years old Hello, Guest!