How to write a js function in the format "let sum = plus(2)(3)"?

Question

JavaScript

Hello! There is a task: "Write your own version of the plus function that will satisfy the code below: 1) The question is, why separate two parameters plus (2) (3), if these parameters can be passed immediately in one bracket plus (2,3) 2) How to implement it in general?
let sum = plus(2)(3); // 5

Answer 1

This function returns a reference to itself.
Here is a great lesson.