How do arrow functions differ from regular functions?

Arrow functions are not just shorter syntax — key behavioral differences:

• No own this — inherits lexical this from outer scope
• No arguments object — use rest params (...args)
• Cannot be constructors — new throws TypeError
• No prototype property

const obj = {
  name: 'Dev',
  regular() { console.log(this.name); },  // 'Dev'
  arrow: () => console.log(this.name),    // undefined
};