SOURCE

var str = 'abcoefoxyozzopp';

let obj = {}

for(let i=0;i<str.length;i++){
    if(!obj[str[i]]){
        obj[str[i]]=1
    }else{
        obj[str[i]]++
    }
}
console.log(obj)
let max = 0
let word = ""

for(var k in obj){
    if(obj[k]>max){
        max= obj[k]
        word = k
    }
}

console.log(max,word)

var str = 'abcoefoxyozzopp';

let obj = {}

for(let i=0;i<str.length;i++){
    if(!obj[str[i]]){
        obj[str[i]]=1
    }else{
        obj[str[i]]++
    }
}
console.log(obj)
let max = 0
let word = ""

for(var k in obj){
    if(obj[k]>max){
        max= obj[k]
        word = k
    }
}

console.log(max,word)