JAVASCRIPT

react arrow funvtion

//declaring arrow function

hello = () => {
	return "hello world";
}

react arrow function component

import React from 'react'

const buttons = () => {
    return (
        <div>
            
        </div>
    )
}

export default buttons

create-react-app arrow function component

import React from 'react'

const HomePage = () => {
  return (
    <div>HomePage</div>
  )
}

export default HomePage

use es6 arrow function in react

npm install --save-dev @babel/plugin-proposal-class-properties

run this in terminal to run arrow functions . 
ig-kiritocode1

what is an arrow function and how is it used in react

const App = () => {
  return (
    <div>
      <h1>List of Courses</h1>
      <hr />
      <CoursesList courses={courses} />
    </div>
  );
}

use const when declaring an arrow function in React class component

//Error:The 'const' modifier can only be used in TypeScript files.
If you're creating an instance method(method inside a class component), 
then no you don't need const. 

If you're creating a generic (i.e. utility) function OUTSIDE of a component, 
then yes you probably should use const.