challenge_2.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Challenge 2</title>
</head>
<body>
    <script>

        var dnaComplement = function (dnaString) {

            var splitDNA = dnaString.split("");
            console.log(splitDNA);


            var newArray = [];

            var complementaryDNA = splitDNA.map(function (base) {

               if (base === "A") {
                    newArray.push ("T")
                } else if (base === "T") {
                    newArray.push ("A")
                } else if (base === "G") {
                    newArray.push ("C")
                } else if (base === "C") {
                    newArray.push ("G")
                }

           });

            console.log(newArray);
            newArray = newArray.join("");
            console.log(newArray);

        };


        dnaComplement("GATACA");

    </script>
</body>
</html>