1Uses of currying function
2  a) It helps to avoid passing same variable again and again.
3
4  b) It is extremely useful in event handling. 
5
6syntax:
7
8     function Myfunction(a) {
9        return (b) => {
10           return (c) => {
11             return a * b * c
12             }
13            }
14         }
15
16
17myFunction(1)(2)(3);

1a technique that applies a function 
2to its arguments one at a time, with 
3each application returning a new function 
4that accepts the next argument.

1// It is also called nested function is ecmascript
2const multiply = (a) => (b) => a*b;
3multiply(3)(4); //Answer is 12
4
5const multipleBy5 = multiply(5);
6multipleBy5(10); //Answer is 50

1Uses of currying function
2  a) It helps to avoid passing same variable again and again.
3
4  b) It is extremely useful in event handling. 
5
6syntax:
7
8     function Myfunction(a) {
9        return (b) => {
10           return (c) => {
11             return a * b * c
12             }
13            }
14         }