Discussion on: Daily Challenge #175 - Complementary DNA

[Klára Neumannová]

OK, I found another one for PHP (7.2 and higher):

function dnaStrand(string $dnaString)
{
    $translateTable = ['A' => 'T', 'T' => 'A', 'C' => 'G', 'G' => 'C'];

    $symbols = str_split($dnaString);

    $complementaryString = '';
    foreach ($symbols as $symbol) {
        $complementaryString .= $translateTable[$symbol] ?? '';
    }

    return $complementaryString;
}