Analyze the most common letters in five-letter words vs all words. Satisfies some curiosity that arose while playing Wordle.

five-letters.js

// Webster's Unabridged English Dictionary from:
// https://github.com/adambom/dictionary
const dictionary = require("./dictionary.json");
const alphabet = 'abcdefghijklmnopqrstuvwxyz';

const fiveLetters = Object.keys(dictionary).filter(word => word.length === 5);

// console.log(alphabet.length);
// console.log(fiveLetters.length);

const alphabetDict = alphabet.split('').reduce((dict, letter) => {
  dict[letter] = 0;
  return dict;
}, {});

// console.log(alphabetDict);

// counts the number of letters in each word and adds to the overall alphabet count
const getDistribution = words => {
  return words.reduce((dict, word) => {
    word.toLowerCase().split('').forEach(letter => {
      if (dict[letter] !== undefined) {
        dict[letter] = dict[letter] + 1;
      }
      return dict;
    });
    return dict;
  }, alphabetDict);
}

// console.log(distribution);

// Sorts by most common and limits to 10 letters
const getDistributionSorted = words => {

  const distribution = getDistribution(words);

  return Object.keys(distribution).sort((a, b) => {
    return distribution[b] - distribution[a];
  }).reduce((acc, letter) => {
    if (Object.getOwnPropertyNames(acc).length < 10) {
      acc[letter] = distribution[letter];
    }
    return acc;
  }, {});
}

console.log('Five Letters: ');
console.log(getDistributionSorted(fiveLetters));

console.log('All Letters: ');
console.log(getDistributionSorted(Object.keys(dictionary)));