I am confused

Question

Can someone explain me this code step by step...
https://code.sololearn.com/WZG3pvtov4Vr/?ref=app

Answer 1

The first line defines an anonymous function within an anonymous function.

const add = a => b => a + b;
// is the same as
const add = function (a) {
return function (b) {
return a + b;
}
}

The functions are defined using the ES6 arrow syntax, which works like this:
(param OR paramList) "=>" (expression OR methodBody)

Examples:
const a = () => console.log('Hello');
a(); // prints hello

const b = c => c * 2;
b(4); // 8

Answer 2

Thank you very much.