Find item with most occurrence (JS)

most_occurrence.js

// -----------------------------
// -----------------------------
// -----------------------------
// Most Occurence Item in Array
// This is just for playing arround.
// -----------------------------
// -----------------------------
// -----------------------------



//////////
////////// Using Hashmap and Sort afterwards
////////// ~1.7s

console.time('start')
var originalValues = [];

for (var i = 0; i < 999999; originalValues.push(++i)) {}
originalValues.push(1);

var map = new Map();
for (var i = originalValues.length - 1; i >= 0; i--) {
	var rowName = ''+originalValues[i].toString();
	map.set(rowName, map.get(rowName) ? map.get(rowName) +1: 1)
}

var y = Array
	.from(map)
	.sort((a, b) => {
		return a[0] - b[0];
	})[0];
console.log(y);
console.log('Biggest number is ' + y[0] + ' with ' +y[1] + ' times');
console.timeEnd('start')



//////////
////////// Using Hashmap, remember largest one
////////// ~29s


console.time('start')
var originalValues = [];

for (var i = 0; i < 100000; originalValues.push(++i)) {}
originalValues.push(3);

var largestName = "";
var largest = -1;

var map = new Map();
for (var i = originalValues.length - 1; i >= 0; i--) {
	var rowName = ''+originalValues[i].toString();
	map.set(rowName, map.get(rowName) ? map.get(rowName) +1: 1)
	if (map.get(rowName)>largest){
		largest = map.get(rowName);
		largestName = rowName;
	}
}
console.log('Largest one is ' + largestName + ' with ' + largest + ' times')
console.timeEnd('start')





//////////
////////// Sort, just remember largest one
////////// ~24s



console.time('start')
var originalValues = [];

for (var i = 0; i < 100000; originalValues.push(++i)) {}
originalValues.push(3);
originalValues.sort();

var maxLength = -1;
var maxItem = null;
var currentLength = -1;
var currentItem = null;

for (var i = originalValues.length - 1; i >= 0; i--) {
	if(currentItem != originalValues[i]){
		currentItem = originalValues[i];
		currentLength = 1;
	}else{
		currentLength++;
	}

	if(maxLength < currentLength){
		maxLength = currentLength;
		maxItem = currentItem;
	}
}

console.log('Largest one is ' + maxItem + ' with ' + maxLength + ' times')
console.timeEnd('start')