Currying Functions in Java with Examples
Last Updated :
18 Sep, 2018
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
import java.util.function.Function;
public class GFG {
public static void main(String args[])
{
Function<Integer,
Function<Integer, Integer> >
curryAdder = u -> v -> u + v;
System.out.println( "Add 2, 3 :"
+ curryAdder
.apply( 2 )
.apply( 3 ));
}
}
|
Example 2: Multiplying 2 numbers using Function Currying
import java.util.function.Function;
public class GFG {
public static void main(String args[])
{
Function<Integer,
Function<Integer, Integer> >
curryMulti = u -> v -> u * v;
System.out.println( "Multiply 2, 3 :"
+ curryMulti
.apply( 2 )
.apply( 3 ));
}
}
|
Example 3: Adding 3 numbers using Function Currying
import java.util.function.Function;
public class GFG {
public static void main(String args[])
{
Function<Integer,
Function<Integer,
Function<Integer, Integer> > >
triadder = u -> w -> v -> u + w + v;
System.out.println( "Add 2, 3, 4 :"
+ triadder
.apply( 2 )
.apply( 3 )
.apply( 4 ));
}
}
|
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