Break up words in a string

wordBreak.js

const wordBreak = (text = '', validWords = []) => {
  
    const wordLookupPos = {};
  
    function breakUpWord (text, validWords, offset) {
       if (wordLookupPos[offset]) {
         return wordLookupPos[offset];
       }
      
       const resultArr = [];
      
       console.log('offset', offset);
       console.log('text.length', text.length);
       if (offset === text.length) {
         resultArr.push('');
       }
      
       for(let i = offset + 1; i <= text.length; i++) {
         const rawSubString = text.substring(offset, i);
         console.log('rawSubString', rawSubString);
         
         if(validWords.includes(rawSubString)) {
           const word = breakUpWord(text, validWords, i);
           resultArr.push(rawSubString + (word === '' ? '' : ' ') + word);
         }
       }
       
      
       return resultArr.join();
    };
  
  
    return breakUpWord(text, validWords, 0);
}


const wordDictionary = ["cats", "bag"];

console.log('>>> RESULT', wordBreak('bagcats', wordDictionary));