Wordle

wordle.js

const words = require("./words.json");
const readline = require("readline");

const EVALUATION = {
  GOOD:  "\x1b[32m■\x1b[0m",
  CLOSE: "\x1b[33m■\x1b[0m",
  BAD:   "\x1b[31m■\x1b[0m"
}; 

const evaluateChar = (wordChars) =>
  (char, index) => {
    const pos = wordChars.indexOf(char);

    if (pos === index) return EVALUATION.GOOD;
    if (pos >= 0)      return EVALUATION.CLOSE;

    return EVALUATION.BAD;
  };

const evaluateGuess = (word, guess) =>
  guess.split("").map(evaluateChar(word.split("")));

const wordFound = (evaluations) =>
  !evaluations.filter(e => e !== EVALUATION.GOOD).length;

const chooseWord = (words) =>
  words[Math.floor(Math.random() * words.length)];

const interface = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

function runGame(word, rounds, interface) {
  if (!rounds) {
    interface.close();
    console.log(word.toUpperCase());
    return;
  }

  interface.question("", (guess) => {
    const evaluations = evaluateGuess(word, guess);
    console.log(evaluations.join(""));

    if (wordFound(evaluations))
      runGame(word, 0, interface);
    else
      runGame(word, rounds - 1, interface);
  });
}

runGame(chooseWord(words), 6, interface);