// Basic
const add = (a, b) => a + b;

// With block body
const add = (a, b) => {
  return a + b;
};

// Single parameter — parentheses optional
const square = x => x * x;

// No parameters
const greet = () => 'Hello!';

flowchart TD
    A["Arrow Functions"]
    B["const fn = (params) => expression"]
    C["✅ Concise syntax"]
    D["✅ Lexical this binding"]
    E["✅ Implicit return"]
    F["❌ No arguments object"]
    G["❌ Cannot be used as constructor"]
    H["❌ No prototype property"]

    A --> B
    A --> C
    A --> D
    A --> E
    A --> F
    A --> G
    A --> H

// Implicit return
const double = x => x * 2;

// With block body (explicit return needed)
const sum = (a, b) => {
  const result = a + b;
  return result;
};

// Returning an object literal
const createUser = (name, age) => ({ name, age });

const obj = {
  name: 'Alice',
  greet: function() {
    setTimeout(() => {
      console.log(this.name); // 'Alice' — arrow inherits this
    }, 100);
  }
};