leet code 387. First Unique Character in a String (javascript)

here is my answer

 

var firstUniqChar = function(s) {

//for getting the count of element, I think Map is necessary.

//so I declared the Map and used for loop for checking the count.

 

let a = new Map()

for(let i = 0; i < s.length; i++){

if(a.has(s[i])){

a.set(s[i], a.get(s[i])+1)

}else{

a.set(s[i], 1)

}

}

 

//after saving the count on Map,

//i need to find out the first factor which is on the first.

// so I use indexOf method, it is find the factor in first index.

//and also there is a possibility that doesn't have any 1 value,

//so I also use else statment, and block to occure the issue.

let result = 0

for(let i = 0; i< s.length; i++){

if(a.get(s[i]) === 1){

result = s.indexOf(s[i])

break

}else result = -1

}

 

return result

 

};

 

I know this code is not perfect, so I'm going to check others' code. Anyway, I solved one more algorithm by myself. That point really means a lot to me. I always struggle to improve myself. I think speed is not the most important thing; the most important thing is the direction.

 

 

 

+ I also change some code like this.

let result = 0

for(let i = 0; i< s.length; i++){

if(a.get(s[i]) === 1){

result = i

break

}else result= -1

}

return result

 

so there are some upgraded on memory and beats.

but not enough