currying in JavaScript?

 Evaluate functions with multiple arguments and decompose them into a sequence of functions with a single argument. 

Using closure

        function add(a) {
            return function add1(b) {
                return function add2(c) {
                    return a + b + c
                }
            }
        }

        const res = add(1);
        const newRes = res(2);
        const newResult = newRes(3);
        console.log(newResult)   // it return 6

Using Curring

Currying is a function that takes one argument at a time and returns a new function expecting the next argument. It is a transformation of functions that translates a function from callable as f(a, b, c) into callable as f(a)(b)(c).

     function add(a) {
            return function add1(b) {
                return function add2(c) {
                    return a + b + c
                }
            }
        }

        const res = add(1)(2)(3);
        console.log(res)  // it return 6

Using bind Method

    a function that accepts multiple arguments. It will transform this function into a series of functions, where every little function will accept a single argument until all arguments are completed

Another example

        userObj = {
            name : 'shreyash',
            age : 20,
        }

        function user(user){
            return function userInfo(e){
                return userObj[e]
            }
        }

        const result = user(userObj);
        console.log(result('name'))

shreyash