numberOfWordOccur.js

// You need to write a method that counts the number of occurences 
// of a word in a given text.

// The word counter is created as follows:

// var sample  = "Lorem ipsum";
// var counter = wordCounter(text);
// Then one can get the count for a given word like this:

// console.log(counter.count("Lorem")); // 1
// console.log(counter.count("hey"));   // 0
// The input texts are simple: they only contain ASCII characters, 
// words are either separate by white spaces or punctuation 
// (only , and .). If the input only contain punctuation or white 
// spaces, it should return a count of 0 for all words.

// For performance reasons, your implementations should count 
// the words once and not parse the text each time the count 
// method is called.

var wordCounter = function(text) {
	var words = text.match(/[a-z']+/gi) || []
  	var counts = {};
  	for (var word of words){
    counts['_' + word] = (counts['_' + word] || 0) + 1;
  	}
    
  return { count: word => counts['_' + word] || 0 }
};


wordCounter("Hello friend ..,  zzzz hows it going:");