Function Currying is a concept of breaking a function with many arguments into many functions with single argument in such a way, that the output is same. In other words, its a technique of simplifying a multi-valued argument function into single-valued argument multi-functions.
Consider the example to clear the concept:
Currying breaks down higher order functions into a series of smaller cascaded functions which take in one argument and return a function except for the last cascaded function which returns the desired value.
Let there be a function which maps as
Currying the above function will produce
Thus maps from to a function which in turn maps from to
The above mathematical expression can also be represented as:
Below are some examples in Java to demonstrate Function Currying:
Example 1: Adding 2 numbers using Function Currying
Add 2, 3 :5
Example 2: Multiplying 2 numbers using Function Currying
Multiply 2, 3 :6
Example 3: Adding 3 numbers using Function Currying
Add 2, 3, 4 :9