function FirstNotRepeatingChar(str)
{
    if(!str) return -1
    str = str.split('')
    let map = {}
    str.forEach((item,index)=>{
        if(map[item]){
            map[item].num++
        }else{
            let obj = {}
            obj.index = index
            obj.num = 1
            map[item] = obj
        }
    })
    let i = Infinity
    Object.values(map).forEach(item=>{
        if(item.num===1&&item.index<i) i = item.index
    })
    if(i==Infinity)i=-1
    return i
    // write code here
}
module.exports = {
    FirstNotRepeatingChar : FirstNotRepeatingChar
};