# Currying Functions in Java with Examples

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.

For example:

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:

Hence,

Below are some examples in Java to demonstrate Function Currying:

Example 1: Adding 2 numbers using Function Currying

 // Java Program to demonstrate Function Currying    import java.util.function.Function;    public class GFG {     public static void main(String args[])     {            // Using Java 8 Functions         // to create lambda expressions for functions         // and with this, applying Function Currying            // Curried Function for Adding u & v         Function >             curryAdder = u -> v -> u + v;            // Calling the curried functions            // Calling Curried Function for Adding u & v         System.out.println("Add 2, 3 :"                            + curryAdder                                  .apply(2)                                  .apply(3));            } }

Output:

Example 2: Multiplying 2 numbers using Function Currying

 // Java Program to demonstrate Function Currying    import java.util.function.Function;    public class GFG {     public static void main(String args[])     {            // Using Java 8 Functions         // to create lambda expressions for functions         // and with this, applying Function Currying            // Curried Function for Multiplying u & v         Function >             curryMulti = u -> v -> u * v;            // Calling the curried functions                   // Calling Curried Function for Multiplying u & v         System.out.println("Multiply 2, 3 :"                            + curryMulti                                  .apply(2)                                  .apply(3));     } }

Output:

Multiply 2, 3 :6

Example 3: Adding 3 numbers using Function Currying

 // Java Program to demonstrate Function Currying    import java.util.function.Function;    public class GFG {     public static void main(String args[])     {            // Using Java 8 Functions         // to create lambda expressions for functions         // and with this, applying Function Currying            // Curried Function for Adding u, v & w         Function > >             triadder = u -> w -> v -> u + w + v;            // Calling the curried functions            // Calling Curried Function for Adding u, v & w         System.out.println("Add 2, 3, 4 :"                            + triadder                                  .apply(2)                                  .apply(3)                                  .apply(4));     } }

Output:

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