Clean Code JavaScript – Function Patterns
Table of Contents
- Single Responsibility
- Function Size
- Parameters
- Side Effects
Single Responsibility
// ❌ Bad
function handleUser(user) {
saveUser(user);
sendEmail(user);
}
// ✅ Good
function saveUser(user) {}
function notifyUser(user) {}
Function Size
Keep functions small (ideally < 20 lines).
Parameters
// ❌ Bad
function createUser(name, age, city, zip) {}
// ✅ Good
function createUser({ name, age, address }) {}
Side Effects
// ❌ Bad
let total = 0;
function add(value) {
total += value;
}
// ✅ Good
function add(total, value) {
return total + value;
}