Wednesday, July 22, 2015

Java Lambda - ToIntBiFunction Functional Interface

ToIntBiFunction Functional Interface

Before we begin to discuss about ToIntBiFunction interface we need to know about BiFunction interface. BiFunction interface represents a function that accepts two arguments T and U and returns result of type R. Input and result are of type Object. Previously we have discussed about BiFunction interface and Function interface. I would highly recommend you to read it. I also have written on higher order functions.

ToIntBiFunction interface represents a function that accepts two argument of type T and U and returns int-valued result.

ToIntBiFunction Interface Declaration

public interface ToIntBiFunction<T, U>
T and U are the input types.

applyAsInt() method

int applyAsInt(T t, U u);
T and U are input for the method applyAsInt(). This function applies the given arguments and returns int result. Let us take simple example of accepting two strings and returning their length.

ToIntBiFunction<String, String> intBiFunc
                                   (str1, str2) -> str1.length()+str2.length();
int result=intBiFunc.applyAsInt("Dell", "Microsoft");
System.out.println(result); //Outputs 13

That’s all on ToIntBiFunction interface.

Read about important java.util.function package’s interface here. Consumer, Function, Supplier, BinaryOperator & Predicate Functional Interfaces. I have also written on High Order functions using Function functional interface.

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