How to use js to know the most frequent characters and their times

var getMax = (str) => {    
    var o = {};    
    for(var i in str){
        o[str[i]] ? o[str[i]]++ : o[str[i]] = 1; 
    }    
    var keys = Object.keys(o);    
    var values = Object.values(o);    
    var maxVal = Math.max.apply(Math,values);
    console.log(keys[values.indexOf(maxVal)],maxVal);
}
getMax('aaabbbbcddeefggggggggggghijjjggk') // g 13
getMax('aaabbbbcddeefggggggggggghijjjk') // g 11
getMax('aaabbggggggggbbcddeefggggggggggghijjjk') // g 19

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