What's the meaning of “=>” in TypeScript? (Fat Arrow)

Question

I just start to learn TypeScript, and I saw there is a lot of code using this sytax =>. I did some research by reading the Specification of TypeScript Versio

Answer 1

Directly from the link in OP:

In this example, the second parameter to 'vote' has the function type

(result: string) => any which means the second parameter is a function returning type 'any' that has a single parameter of type 'string' named 'result'.