Functional Programming

* Impreative
* Declarative

Core concept of Funtional Programming

* Immutability
* Separating functions and data
* First-class functions

Dependency

* ESLint- plugin-immutable
    npm install eslint-plugin-immutable --save-dev
    npx eslint --init
    npm install --save-dev eslint-plugin-immutable
    npx eslint .

Closure

Map

Filter

Reduce

Sort

Recursion

Partial Application