Question

I have a JSON-encoded PHP array:

<script>
var registeredEmails = <?php echo(json_encode($emails)); ?>;
</script>

To check that this works, I do this:

console.log(registeredEmails);
// this outputs: ["[e-mail]", "[e-mail]"]

And now I would like to iterate through that JSON and test a certain string against all the strings it contains.

for (var email in registeredEmails) {
    if (registeredEmails.hasOwnProperty(email)) {

        var duplicate = registeredEmails[email];

        console.log(duplicate + ' is typeof: ' + typeof(duplicate));
        // this outputs: [e-mail] is typeof: string

        //  $(this).val() is a string from somewhere else
        if (duplicate.test($(this).val())) {
            // we found a match
        };
    }
}

As I understand it, the test() method tests for matches on strings. I’ve tested to make sure that my variable duplicate is a string, but apparently it’s still an object. I’m given the following JS error:

Uncaught TypeError: Object [e-mail] has no method 'test'

Why is that?

Answer 1

test() is a method of the RegEx object, not String.

Your best bet would probably be to use String.search() instead. You could also probably use String.indexOf() if you’re not trying to use Regular Expression matching.