check repeatation in the given string and find largest time found world in javascript

 check repeatation in the given string and find largest time found world

<script>

const stringcharcount = (str)=>{

alert();

let obj = {};

for(let char of str)

(!obj[char]) ?obj[char]=1:obj[char]++;

let maxnumber = 0;

let maxchar = '';

for(let char in obj)

    if(obj[char] >= maxnumber){

        maxnumber = obj[char];

        maxchar = char;

    }

   console.log("maximum char:"+maxchar + "occurance "+ maxnumber) 

}

stringcharcount("vishalvuisete333");

</script>