JavaScript implements finding the first non-repeating character in a string_javascript tips

This algorithm is for reference only. Xiao Cai basically doesn’t understand advanced algorithms and can only express it with the simplest thoughts.

Copy code The code is as follows:

//Find the first non-repeating character in the string
// firstUniqueChar("vdctdvc"); --> t
function firstUniqueChar(str){
var str = str || "",
i = 0,
        k = "",
​​​ _char = "",
charMap = {},
result = {name: "",index: str.length};
for(i=0;i _char = str.charAt(i);
If(charMap[_char] != undefined){
​​​ charMap[_char] = -1;
}else{
charMap[_char] = i;
}
}
for(k in charMap){
If(charMap[k]<0){
Continue;
}
If(result.index>charMap[k]){
        result.index = charMap[k];
       result.name = k;
}
}
Return result.name;
}

If you guys have any better ideas, please let me know, I’d be very grateful