function maxChar(string) {
	var characterMap = {};
	var max = 0;
	var maxCharacter = '';

	for (var character of string) {
		if(characterMap[character] === undefined) {
			characterMap[character] = 1;
		} else {
			characterMap[character]++;
		}
	}

	for (var character in characterMap) {
		if (characterMap[character] > max) {
			max = characterMap[character];
			maxCharacter = character;
		}
	}

	return maxCharacter;
}