function countRepeatedWords(sentence) {
  let words = sentence.split(" ");
  let wordMap = {};
  
  words.forEach(word => {
    wordMap[word] = (wordMap[word] || 0) + 1;
  });
  
  return wordMap;
}

let sentence = "Awesome Javascript coding woohoo";
console.log(countRepeatedWords(sentence));
...