print a list of 50 random words (weighted lengths) with scrabble letter frequency

random-words.js

const normalize = a => a.reduce((arr, val, i) => {arr[i + 1] = arr[i] + val; return arr;}, [0]).map((v, i, arr) => v / arr[arr.length - 1]);
const getWeighted = (a, r) => a.findIndex(v => v > r);

const letters = 'abcdefghijklmnopqrstuvwxyz'.split('');
const letterWeights = normalize([9, 2, 2, 4, 12, 2, 3, 2, 9, 1, 1, 4, 2, 6, 8, 2, 1, 6, 4, 6, 4, 2, 2, 1, 2, 1]);
const wordLengthWeights = normalize([0, 1, 7, 4, 4, 4, 5, 3, 4, 2, 1, 1, 1, 1, 1, 1, 1]);  // 1, 2, 3...

console.log(Array.from({length: 50}, (_, i) =>
  Array.from({length: getWeighted(wordLengthWeights, Math.random())}, () => letters[getWeighted(letterWeights, Math.random())]).join('')
).sort((a, b) => a.length - b.length).join('\n'));