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code every day with me

--DAY 4--
Hi, I am going to make #100DaysOfCode Challenge.Everyday I will try solve 1 problem from leetcode or hackerrank. Hope you can go with me until end.
Now let's solve problem today:
-Problem: Longest Common Prefix
-My solution (javascript):

var longestCommonPrefix = function(str) {
    if(str.length==0) return '';
    let prefix='';
    for(let i=0;i<str[0].length;i++){
        let check=true;
        for(let j=1;j<str.length;j++){
                return prefix;
        if(check) prefix+=str[0].charAt(i);
    return prefix;
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-->If you have better solution or any question, please comment below. I will appreciate.

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