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package com.linkedin.parseq.function;

import java.util.Objects;


@FunctionalInterface
public interface Function1 {

  R apply(T1 t1) throws Exception;

  default  Function1 andThen(Function1 f) {
    Objects.requireNonNull(f);
    return (T1 t1) -> f.apply(apply(t1));
  }

  /**
   * Returns a function that always returns its input argument.
   *
   * @param  the type of the input and output objects to the function
   * @return a function that always returns its input argument
   */
  static  Function1 identity() {
    return t -> t;
  }

}