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Essential utilities for modern Java.

There is a newer version: 2020.02.27

package com.simplaex.bedrock;

import javax.annotation.Nonnull;
import java.util.function.BiFunction;

@FunctionalInterface
public interface Function2 extends BiFunction {

  @Override
  R apply(final A a, final B b);

  @Nonnull
  default Function1 bind(final A a) {
    return (b) -> Function2.this.apply(a, b);
  }

  @Nonnull
  default Function0 bind(final A a, final B b) {
    return () -> Function2.this.apply(a, b);
  }

  @Nonnull
  default Function1, R> tupled() {
    return (t) -> Function2.this.apply(t.getFirst(), t.getSecond());
  }

  @Nonnull
  default Function1> curried() {
    return a -> b -> this.apply(a, b);
  }

  @Nonnull
  default Function2 flipped() {
    return new Function2() {
      @Override
      public R apply(final B b, final A a) {
        return Function2.this.apply(a, b);
      }

      @Override
      public Function2 flipped() {
        return Function2.this;
      }
    };
  }

  @Nonnull
  static  Function2 from(final BiFunction f) {
    return f::apply;
  }
}