What is the different of using =, =>, : in react?

Question

I'm a bit new to react. I can use them with my past experiences. For example, I need sth to describe, I found a similar declaration and use the same shape. But I would like to learn the fundamentals. I mean when should I use below operators;

const sth : ...
() => ...
const sth = ...

If you list the basis of these usages, I would add on them with docs.

There is no `const sth => ...` That syntax would be invalid. — Sulthan, Nov 18 '19 at 07:14

Dennis Vash · Accepted Answer · 2019-11-18T07:16:27.723

2

Those are fundamentals of Javascript and Typescript (or any type definition with js) and not React, please refer to A re-introduction to JavaScript (JS tutorial) in MDN docs.

Arrow function

(param1, param2, …, paramN) => { statements } // const sth = () => ...

Assignment operator

const sth = ...

Typescript type or any kind of type definition like flow

let isDone: boolean = false;

edited Nov 18 '19 at 07:16

answered Nov 18 '19 at 07:12

Dennis Vash

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not only "typescript", but any kind of type definition, e.g. "flow". – Sulthan Nov 18 '19 at 07:15

What is the different of using =, =>, : in react?

1 Answers1