word_count_w_split.js

function wordCount(str) {
  var words = str.toLowerCase().split(/\W*\s\W*|[^'\w]+/);
  
  var incrementWordCount = (word_count, word) => { 
     word_count[word] = 1 + (word_count[word] | 0)
     return word_count;
  };
  
  return words.reduce(incrementWordCount, {});
}