# Package org.apache.commons.lang3.function

Provides functional interfaces to complement those in `java.lang.function` and utilities for working with Java 8 lambdas.

Contains failable functional interfaces that address the fact that lambdas are supposed not to throw Exceptions, at least not checked Exceptions, A.K.A. instances of `Exception`. A failable functional interface declares a type of Exception that may be raised if the function fails.

Since:
  3.11

Interface Summary
FailableBiConsumer<T,​U,​E extends java.lang.Throwable>: A functional interface like `BiConsumer` that declares a `Throwable`.
FailableBiFunction<T,​U,​R,​E extends java.lang.Throwable>: A functional interface like `BiFunction` that declares a `Throwable`.
FailableBiPredicate<T,​U,​E extends java.lang.Throwable>: A functional interface like `BiPredicate` that declares a `Throwable`.
FailableBooleanSupplier<E extends java.lang.Throwable>: A functional interface like `BooleanSupplier` that declares a `Throwable`.
FailableCallable<R,​E extends java.lang.Throwable>: A functional interface like `Callable` that declares a `Throwable`.
FailableConsumer<T,​E extends java.lang.Throwable>: A functional interface like `Consumer` that declares a `Throwable`.
FailableDoubleBinaryOperator<E extends java.lang.Throwable>: A functional interface like `DoubleBinaryOperator` that declares a `Throwable`.
FailableDoubleConsumer<E extends java.lang.Throwable>: A functional interface like `DoubleConsumer` that declares a `Throwable`.
FailableDoubleFunction<R,​E extends java.lang.Throwable>: A functional interface like `DoubleFunction` that declares a `Throwable`.
FailableDoublePredicate<E extends java.lang.Throwable>: A functional interface like `DoublePredicate` that declares a `Throwable`.
FailableDoubleSupplier<E extends java.lang.Throwable>: A functional interface like `DoubleSupplier` that declares a `Throwable`.
FailableDoubleToIntFunction<E extends java.lang.Throwable>: A functional interface like `DoubleToIntFunction` that declares a `Throwable`.
FailableDoubleToLongFunction<E extends java.lang.Throwable>: A functional interface like `DoubleToLongFunction` that declares a `Throwable`.
FailableDoubleUnaryOperator<E extends java.lang.Throwable>: A functional interface like `DoubleUnaryOperator` that declares a `Throwable`.
FailableFunction<T,​R,​E extends java.lang.Throwable>: A functional interface like `Function` that declares a `Throwable`.
FailableIntBinaryOperator<E extends java.lang.Throwable>: A functional interface like `IntBinaryOperator` that declares a `Throwable`.
FailableIntConsumer<E extends java.lang.Throwable>: A functional interface like `IntConsumer` that declares a `Throwable`.
FailableIntFunction<R,​E extends java.lang.Throwable>: A functional interface like `IntFunction` that declares a `Throwable`.
FailableIntPredicate<E extends java.lang.Throwable>: A functional interface like `IntPredicate` that declares a `Throwable`.
FailableIntSupplier<E extends java.lang.Throwable>: A functional interface like `IntSupplier` that declares a `Throwable`.
FailableIntToDoubleFunction<E extends java.lang.Throwable>: A functional interface like `IntToDoubleFunction` that declares a `Throwable`.
FailableIntToLongFunction<E extends java.lang.Throwable>: A functional interface like `IntToLongFunction` that declares a `Throwable`.
FailableIntUnaryOperator<E extends java.lang.Throwable>: A functional interface like `IntUnaryOperator` that declares a `Throwable`.
FailableLongBinaryOperator<E extends java.lang.Throwable>: A functional interface like `LongBinaryOperator` that declares a `Throwable`.
FailableLongConsumer<E extends java.lang.Throwable>: A functional interface like `LongConsumer` that declares a `Throwable`.
FailableLongFunction<R,​E extends java.lang.Throwable>: A functional interface like `LongFunction` that declares a `Throwable`.
FailableLongPredicate<E extends java.lang.Throwable>: A functional interface like `LongPredicate` that declares a `Throwable`.
FailableLongSupplier<E extends java.lang.Throwable>: A functional interface like `LongSupplier` that declares a `Throwable`.
FailableLongToDoubleFunction<E extends java.lang.Throwable>: A functional interface like `LongToDoubleFunction` that declares a `Throwable`.
FailableLongToIntFunction<E extends java.lang.Throwable>: A functional interface like `LongToIntFunction` that declares a `Throwable`.
FailableLongUnaryOperator<E extends java.lang.Throwable>: A functional interface like `LongUnaryOperator` that declares a `Throwable`.
FailableObjDoubleConsumer<T,​E extends java.lang.Throwable>: A functional interface like `ObjDoubleConsumer` that declares a `Throwable`.
FailableObjIntConsumer<T,​E extends java.lang.Throwable>: A functional interface like `ObjIntConsumer` that declares a `Throwable`.
FailableObjLongConsumer<T,​E extends java.lang.Throwable>: A functional interface like `ObjLongConsumer` that declares a `Throwable`.
FailablePredicate<T,​E extends java.lang.Throwable>: A functional interface like `Predicate` that declares a `Throwable`.
FailableRunnable<E extends java.lang.Throwable>: A functional interface like `Runnable` that declares a `Throwable`.
FailableSupplier<R,​E extends java.lang.Throwable>: A functional interface like `Supplier` that declares a `Throwable`.
FailableToDoubleBiFunction<T,​U,​E extends java.lang.Throwable>: A functional interface like `ToDoubleBiFunction` that declares a `Throwable`.
FailableToDoubleFunction<T,​E extends java.lang.Throwable>: A functional interface like `ToDoubleFunction` that declares a `Throwable`.
FailableToIntBiFunction<T,​U,​E extends java.lang.Throwable>: A functional interface like `ToIntBiFunction` that declares a `Throwable`.
FailableToIntFunction<T,​E extends java.lang.Throwable>: A functional interface like `ToIntFunction` that declares a `Throwable`.
FailableToLongBiFunction<T,​U,​E extends java.lang.Throwable>: A functional interface like `ToLongBiFunction` that declares a `Throwable`.
FailableToLongFunction<T,​E extends java.lang.Throwable>: A functional interface like `ToLongFunction` that declares a `Throwable`.

Class Summary
Failable: This class provides utility functions, and classes for working with the `java.util.function` package, or more generally, with Java 8 lambdas.