Reverse string using for loop

[gentle9278]

hi guys, i don’t understand why both can’t work
in writing 1 using temp
using temp and change the first and the last element,
but why it didn’t reverse?

in writing 2 after googling, still don’t know why
thank you for your help~
##writing 1

function solution(str){
  var strArr=str.split("");
  var temp;
  for(i=0;i<str.length;i++)
    {temp=strArr[i];
     strArr[i]=strArr[str.length-i];
     strArr[str.length-i]=temp;
    }
  return strArr.join("");
}

##writing 2

function solution(str){
  var s=;
 for(var i=1;i==str.length;i++){

 s+=str.charAt(str.length-i);
}
return s;
}

[ilenia]

@gentle9278

var s=;

syntax error

@gentle9278

i==str.length

this is true for only one single value of i

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