10 JavaScript concepts every Node developer must master

Node.js has become a leading platform for building web apps and systems software using JavaScript on the back end. Key concepts for Node.js developers include closures, prototypes, private properties, modules, error handling, currying, and function manipulation methods. Understanding these concepts helps write scalable and efficient code. Recent JavaScript features like private hash names and ES6 modules are becoming more common. Proper error handling and optimization techniques like memoization are crucial for robust Node.js applications.