clean-codejs-functions

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 ; }