ReverseString a C interview-question

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I was asked for my 'input' on a piece of code written by a young programmer in an interview. They hinted at a potential issue and stated that it would be frequently employed on huge strings.

public string ReverseString(string sz)
{
    string result = string.Empty;
    for(int i = sz.Length-1; i>=0; i--)
    {
      result += sz[i]
    }
    return result;
}

I was unable to locate it. There were no issues that I noticed. In retrospect, I could have suggested the user should resize, but C# doesn't appear to have one (I'm a C++ guy).

I ended up putting things like utilise an iterator if possible, [x] in containers could not be random access, therefore it would be sluggish, and so on. and a few other things However, I specifically stated that I had never had to optimise C# code, indicating that my reasoning did not fail me during the interview.

I'm curious as to what the issue is with this code; do you see it?

Jun 11, 2022 in C# by jyoti
• 1,240 points
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