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Challenge 24: Pangram

curriculum/challenges/english/blocks/daily-coding-challenges-javascript/6821ec02237de8297eaee79a.md

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--description--

Given a word or sentence and a string of lowercase letters, determine if the word or sentence uses all the letters from the given set at least once and no other letters.

  • Ignore non-alphabetical characters in the word or sentence.
  • Ignore letter casing in the word or sentence.

--hints--

isPangram("hello", "helo") should return true

js
assert.isTrue(isPangram("hello", "helo"));

isPangram("hello", "hel") should return false

js
assert.isFalse(isPangram("hello", "hel"));

isPangram("hello", "helow") should return false

js
assert.isFalse(isPangram("hello", "helow"));

isPangram("hello world", "helowrd") should return true

js
assert.isTrue(isPangram("hello world", "helowrd"));

isPangram("Hello World!", "helowrd") should return true

js
assert.isTrue(isPangram("Hello World!", "helowrd"));

isPangram("Hello World!", "heliowrd") should return false

js
assert.isFalse(isPangram("Hello World!", "heliowrd"));

isPangram("freeCodeCamp", "frcdmp") should return false

js
assert.isFalse(isPangram("freeCodeCamp", "frcdmp"));

isPangram("The quick brown fox jumps over the lazy dog.", "abcdefghijklmnopqrstuvwxyz") should return true

js
assert.isTrue(isPangram("The quick brown fox jumps over the lazy dog.", "abcdefghijklmnopqrstuvwxyz"));

--seed--

--seed-contents--

js
function isPangram(sentence, letters) {

  return sentence;
}

--solutions--

js
function isPangram(sentence, letters) {
  const usedLetters = [];
  for (let i = 0; i < sentence.length; i++) {
    const letter = sentence[i].toLowerCase();
    if (!usedLetters.includes(letter) && /[a-z]/.test(letter)) {
      usedLetters.push(letter);
    }
  }

  const sortedLetters = letters.split('').sort().join('');
  const sortedUsedLetters = usedLetters.sort().join('');

  return sortedLetters === sortedUsedLetters;
}