Palindrome Challenge

index.js

// node . [total-words] (e.g. node . 1000)
const firstAlphabetLetter = "a".charCodeAt();
const alphabetRange = "z".charCodeAt() - firstAlphabetLetter;

const [,,totalWordsArg = 10000] = process.argv;

const generateRandomWord = (min, max) => {
  const randomMaxChars = Math.floor(Math.random() * max);
  let word = "";
  for (let i = 0; i <= min || i <= randomMaxChars; i++) {
    word += String.fromCharCode(
      firstAlphabetLetter + Math.random() * alphabetRange
    );
  }
  return word;
};

const main = (totalWords = 10000) => {
  const words = [];
  for (let i = 0; i <= totalWords; i++) {
    words.push(generateRandomWord(3, 5));
  }

  return words.reduce((sum, word) => {
    if (word === word.split("").reverse().join("")) {
      sum++;
    }
    return sum;
  }, 0);
};

const palindromeCount = main(totalWordsArg);

console.log(`Found ${palindromeCount} palindrome words`);