find all words which contains different letters in javascript

index.tsx
function containsDifferentLetters(word) {
  // convert the word to an array of characters
  const chars = word.split('');

  // use a set to count the number of unique characters
  const uniqueChars = new Set(chars);

  // if the number of unique characters is the same as the length of the word,
  // then all the characters are unique
  return uniqueChars.size !== word.length;
}

function findWordsWithDifferentLetters(words) {
  // use filter to find all the words in the array that contain different letters
  return words.filter(word => containsDifferentLetters(word));
}

// example usage
const words = ['hello', 'world', 'unique', 'letters', 'javascript'];
const result = findWordsWithDifferentLetters(words);
console.log(result); // ['unique', 'letters']
764 chars
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