Notice that the core arrow operator syntax is virtually identical to JavaScript, and they do the same thing, i.e., create a function that accepts arguments, performs logic, and returns a value.

It is, however, wrapped inside of JavaScript. The HTML is a return value for the App function, which is a functional component in React. The JSX markup is the function’s return value.

Microsoft has backed a proposal to bring optional and erasable type syntax to JavaScript in an effort to make its TypeScript language both faster and easier to use.