js常见算法

            let str=‘xiaoshuo-ss-sfff-fe‘;
            let arr=str.split("")
            arr.map((item,index)=>{
                if(item===‘-‘){
                    arr[index+1]=arr[index+1].toUpperCase()
                    arr.splice(index,1)
                }
            })

            let str=‘xiaoshuo-ss-sfff-fe‘;
            let obj={}
            let o=str.split("").map(item=>{
                if(obj[item]){
                    obj[item]++
                }else{
                    obj[item]=0
                    obj[item]++
                }
                return obj
            }).splice(-1,1)[0]
            const bb=Math.max(...Object.values(o))
            for(let key in o){
                if(o[key]===bb){
                    console.log(key)
                }
            }