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• HFoldr.java

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com.github.tonivade.purefun.generic.HFoldr Maven / Gradle / Ivy

/*
 * Copyright (c) 2018-2020, Antonio Gabriel Muñoz Conejo 
 * Distributed under the terms of the MIT License
 */
package com.github.tonivade.purefun.generic;

import com.github.tonivade.purefun.Tuple;
import com.github.tonivade.purefun.Tuple2;
import com.github.tonivade.purefun.generic.HList.HCons;
import com.github.tonivade.purefun.generic.HList.HNil;

@FunctionalInterface
public interface HFoldr, R> {

  R foldr(T value, V initialValue, L list);

  static  HFoldr foldr() {
    return (head, value, list) -> value;
  }

  static , R, X> HFoldr, X>
      foldr(HApply, X> apply, HFoldr foldr) {
    return (head, value, list) ->
      apply.apply(head, Tuple.of(list.head(), foldr.foldr(head, value, list.tail())));
  }
}