$.java

import java.util.function.Consumer;
import java.util.function.Function;

public class $<T> {
  final private Function<T, T> f;

  public $(Consumer<T> c) {
    this.f = apply(c);
  }

  private $(Function<T, T> o) {
    this.f = o;
  }

  public $<T> $(Consumer<T> c) {
    return new $(compose(c));
  }

  public T $(T t) {
    return f.apply(t);
  }

  private Function<T, T> apply(Consumer<T> consumer) {
    return (t -> {
      consumer.accept(t);
      return t;
    });
  }

  private Function<T, T> compose(Consumer<T> consumer) {
    return f.compose(apply(consumer));
  }
}