function findWordDistance(text, wordA, wordB) {
    let words = text.split(' '),
    wordAIndex = null,
     wordBIndex = null,
     minDinstance = null,
     maxDistance = null;
    
    for (let i = 0, length = words.length; i < length; i++ ) {
      if (words[i] === wordA) {
        wordAIndex = i;
       
      }
      
      if (words[i] === wordB) {
        wordBIndex = i;
      }
  
      if ( wordAIndex !== null && wordBIndex !== null ) {
        let distance = Math.abs(wordAIndex - wordBIndex);
        if (minDinstance === null || minDinstance > distance) {
          minDinstance = distance;
        } else if (maxDistance === null || maxDistance < distance) {
            maxDistance = distance;
        }
      }
    }
    return [minDinstance, maxDistance];
  }

 findWordDistance('one asd two dd aaa ddd dd dd dd ddd two ddd ff ggg fff asd one', 'one', 'two');