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• Function1Instances.java

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/*
 * Copyright (c) 2018-2019, Antonio Gabriel Muñoz Conejo 
 * Distributed under the terms of the MIT License
 */
package com.github.tonivade.purefun.instances;

import com.github.tonivade.purefun.Function1;
import com.github.tonivade.purefun.Higher2;
import com.github.tonivade.purefun.Instance;
import com.github.tonivade.purefun.typeclasses.Profunctor;

public interface Function1Instances {

  static Profunctor profunctor() {
    return new Function1Profunctor() {};
  }
}

@Instance
interface Function1Profunctor extends Profunctor {
  @Override
  default  Higher2 dimap(Higher2 value, Function1 contramap, Function1 map) {
    Function1 function = value.fix2(Function1::narrowK);
    return function.compose(contramap).andThen(map);
  }
}