3

I want to calculate string length in bytes. Here is the sample code I used.

function mine(string s  ) public view returns (bytes) {
        return bytes(s).length;
}

But throws this error- 

TypeError: Return argument type uint256 is not implicitly convertible to expected type (type of first return variable) bytes memory.
         return bytes(s).length;
                ^-------------^
Divya Galla
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1 Answers1

9

If you want to return byte-length of the string, you will need to modify your return type like this:

function mine(string s) public view returns (uint256) {
  return bytes(s).length;
}

This method will only return byte-length of your string.

For UTF-string length, follow Alexey's answer in detail here: https://ethereum.stackexchange.com/a/13886/5018

Harsh Vakharia
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  • Hey, Harsh Vakharia can you answer a similar question- https://ethereum.stackexchange.com/questions/55086/calculate-integer-input-length – Divya Galla Jul 25 '18 at 09:20