wordMap.js

var myWordMap = {};

function generateWordMap(arg) {
   // var wordMap = {};
   var blacklistedWords = ['after', 'the', 'and', 'then'];
   var wordArr = arg.replace(/[.,:]/g, '').split(' ');
   var word;
   for(var i = 0, il = wordArr.length; i < il; i++) {
       word = wordArr[i].toLowerCase();
       if (!blacklistedWords.includes(word)) {
       myWordMap[word] = (myWordMap[word] || 0) + 1; 
       }
   };
}

console.log(generateWordMap('After beating the eggs, Dana read the next step:'));
console.log(generateWordMap('Add milk and eggs, then add flour and sugar.'));
console.log(myWordMap);