is-verb.js

function IsVerb({ wordnok }) {
  return isVerb;

  function isVerb(word, done) {
    wordnok.getPartsOfSpeech(word.toLowerCase(), checkPOS);

    function checkPOS(error, partsOfSpeech) {
      if (error) {
        done(error);
      } else {
        var result =
          partsOfSpeech.length > 0 && partsOfSpeech.every(isSomeKindOfVerb);
        done(null, result);
      }
    }
  }
}

function isSomeKindOfVerb(partOfSpeech) {
  return (
    partOfSpeech === 'verb' ||
    partOfSpeech === 'verb-transitive' ||
    partOfSpeech === 'verb-intransitive'
  );
}

module.exports = IsVerb;