A Before Combinator

Before.java

@FunctionalInterface
public interface Before<T, R>
        extends Function<Consumer<T>,
                Function<Function<T, R>,
                Function<T, R>>> {

    static <T, R> Before<T, R> create() {
        return before -> function -> argument -> {
            before.accept(argument);
            return function.apply(argument);
        };
    }

    static <T, R> Function<T, R> decorate(
            Consumer<T> before, 
            Function<T, R> function) {
        return Before.<T, R>create().apply(before).apply(function);
    }
}