🎁 Functional Programming

✅ 1. Pure Function ✔ ✅ 2. First Class Function ✔ ✅ 3. Higher Order Function, Closure & Callback ✔ ✅ 4. Execution Context ✅ 5. Lexical Scope ✅ 6. Return Function from Another Function ✔ ✅ 7. curring ✔ ✅ 8. Function Composition ✔