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JavaScript concepts you need to know before getting into React...

1.Arrow Functions:
An arrow function expression is a compact alternative to a
traditional function expression.

2.Let/var/const variables:
Understand the difference between them, uses and their
respective scopes.

3.Destructuring assignment:
JavaScript expression that makes it possible to unpack values
from arrays, or properties from objects, into a bunch of

4.Template Literals:
With ES6, a newer form of string called template literal was
given, which consists of two backticks .

5.Using Fetch:
The Fetch API provides a JavaScript interface for accessing and
manipulating parts of the HTTP pipeline, such as requests and

6.Import / Export:
ES6 gave people ability to share code between their own
JavaScript files as well as third-party libraries using ES

7.Async Js, Promise, Callback:
Such topics have been given in this thread, checkout.

8.Array functions- Map, Reduce, and Filter:,instead%20of%20using%20the%20loops.

If You Want to learn Javascript in detail you can refer
"Namaste Javascript" YouTube playlist 👇

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