Repeated Character

var userInput = prompt("Enter a splittedArraying...");

var splittedArray = userInput.split('');

var repeatedCharacter = {};

for (i = 0; i < splittedArray.length; i++) {
    if (splittedArray[i] in repeatedCharacter) {
        repeatedCharacter[splittedArray[i]]++;
    } else {
        repeatedCharacter[splittedArray[i]] = 1;
    }
}
var characterCounter = Object.entries(repeatedCharacter);
for (i in characterCounter) {
    document.write(characterCounter[i][0] + ' - ' + characterCounter[i][1] + '<br>');
}