Declaring an event handler in React via simplified syntax - what does this line of code do? How to google details about it?

Question

JavaScript

I'm learning react. Found a convenient option for declaring an event handler.
(without using constructor and bind).

handleClick = (event) =>{
    ...
};

What is it?
Reminds function expression through function arrow. But there is no const.
Is this a new JS feature? Or the magic of React?
How to google details about it?

Answer 1

it's just a class field that an arrow function is assigned to, the
arrow function doesn't have its own context, so you don't have to explicitly bind the context in the constructor,
it's just handy when you use something with "this" in methods, like this:
this.setState({...});