String concatenation in solidity?

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how do i concatenate strings in solidity?

var str = 'asdf'
var b = str + 'sdf'

seems not to work..

I looked up the documentation (https://github.com/ethereum/wiki/wiki/Solidity-Tutorial#elementary-types-value-types) and there is not much mentioned about string concatenation. But it is stated that it works with the dot ('.') ?

"[...] a mapping key k is located at sha3(k . p) where . is concatenation."
Sep 21, 2018 in Blockchain by digger
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library can be used, for example:

import "github.com/Arachnid/solidity-stringutils/strings.sol";

contract C {
  using strings for *;
  string public s;

  function foo(string s1, string s2) {
    s = s1.toSlice().concat(s2.toSlice());
  }
}
answered Sep 21, 2018 by slayer
• 29,040 points

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