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Java Input-Output Monad

There is a newer version: 3.0.0-RC2

package jio.console;

import jsonvalues.*;
import jsonvalues.spec.JsParserException;

import java.util.Arrays;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.IntStream;


final class Functions {

  private Functions() {
  }

  static final Function>> toJson = str -> {
    try {
      return JsObj.parse(str);
    } catch (JsParserException e) {
      try {
        return JsArray.parse(str);
      } catch (Exception ex) {
        throw new RuntimeException("A well-defined Json expected.");
      }
    }
  };
  static final Function> tail =
      tokens -> Arrays.stream(tokens)
                      .toList()
                      .subList(1,
                               tokens.length);

  static String joinTail(String[] tokens) {
    return String.join(" ",
                       tail.apply(tokens));
  }

  static String indent(final JsPath path) {
    return IntStream.range(0,
                           (int) Math.pow(2,
                                          path.size()
                                         )
                          )
                    .mapToObj(i -> " ")
                    .collect(Collectors.joining());
  }


}