hangman.js

//download file and run with node hangman.js

function wrongGuessCount(word, guesses) {
  return guesses.filter(letter => word.indexOf(letter) == -1).length;
}
function showGuess(word, guesses) {
  let show = [];
  let letters = word.split("");
  letters.filter(letter => guesses.indexOf(letter) > -1 ? show.push(letter) : show.push("_"));
  show = show.join(" ");
  return show;
}
function isWinner(word, guesses) {
  let currentBoard = showGuess(word, guesses);
  if (currentBoard.indexOf("_") > -1) {
    return false;
  } else {
    return true;
  }
}
const readline = require("readline");
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});
const fs = require("fs");

function next(word, guesses) {
  if (isWinner(word, guesses)) {
    console.log(`You have won. The word was ${word}`);
    process.exit();
  }
  console.log(showGuess(word, guesses));

  if (wrongGuessCount(word, guesses) >= 6) {
    console.log(`You lose. The word was ${word}`);
    process.exit();
  }
  console.log(`You have made ${wrongGuessCount(word,guesses)} incorrect guesses. You have ${6 - wrongGuessCount(word,guesses)} incorrect guesses remaining.`);
  rl.question("next letter? ", answer => {
    guesses.push(answer.toLowerCase().trim()[0]);
    console.log("player wrote:", answer[0]);
    next(word, guesses);
  });
}

let mysteryWord = "pelican";
const dictionary = fs.readFile('/usr/share/dict/words', 'utf8', function(err, data) {
  if (err) throw err;
  let wordArray = data.split('\n');
  mysteryWord = wordArray[Math.floor(Math.random() * wordArray.length)];
  next(mysteryWord, []);
});