Currying

What is currying?

A. “Returning a function that takes multiple arguments” into a “chain of functions that takes one argument”

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// Without Currying
const add = (x, y) => x + y;
console.log(add(1, 2)); // 3

// Currying: Ver 1
const _add = (x) => (y) => x + y;
console.log(_add(1)(2)); // 3

// Currying: Ver 2
const __add = (x) => {
  return (y) => {
    return x + y;
  };
};
console.log(__add(1)(2)); // 3

// Currying: Ver 3
const ___add = function (x) {
  return function (y) {
    return x + y;
  };
};
console.log(___add(1)(2)); // 3

// *Ver 2 and Ver 3 are the same as Ver1. They are just for explanation.