wordCountExample.js

let words = ['cat','dog','mouse','rabbit','dog','dog','mouse','cat'];

let wordsSet = new Set(words)

let wordMap = new Map();

for(word in words){
	let current = words[word];
	if (wordMap.has(current)){
		//is in the map, so get the current value and increment by one
		let currentVal = wordMap.get(current);
		currentVal++;
		//update the value in the map
		wordMap.set(current, currentVal);
	}
	else{
		//not in the map, set its value to 1
		wordMap.set(current,1)
	}
}

//test to see if the size of the map is the same as the size of the set
let sameSizeTest = wordMap.size == wordsSet.size;