[JSMentors] Accessing private vars in the revealing module pattern

[Nick Morgan]

Hi guys

Thought I'd share a little toy I just made, to see what you thought:

http://jsfiddle.net/skilldrick/EjHWT/1/

var obj = (function () {
    var private = 5;
    var private2 = 10;

    function clean(varName) {
        var invalidIdentifier = /[^\w]+/g;
        if (varName.match(invalidIdentifier)) {
            throw new ReferenceError(varName + ": Invalid identifier");
        }
        return varName.replace(/[^\w]+/g, '');
    }

    function send(varName) {
        return eval(clean(varName));
    }

    return {
        send: send
    };
})();

function logResultOrLogError(func) {
    try {
        console.log(func());
    } catch (e) {
        console.log(e);
    }
}

logResultOrLogError(function () {
    return obj.send('private');
});
logResultOrLogError(function () {
    return obj.send('blah');
});
logResultOrLogError(function () {
    return obj.send('alert("I am teh hax0rz")');
});


It gives you access to the value of private vars via a safe eval.
Thought it might come in useful for testing occasionally. I'm not
suggesting using it in production code, just thought it was a nice
idea :) So, what do you think?

Cheers
-- 
Nick Morgan
http://skilldrick.co.uk
@skilldrick

Save our in-boxes! http://emailcharter.org

-- 
To view archived discussions from the original JSMentors Mailman list: 
http://www.mail-archive.com/jsmentors@jsmentors.com/

To search via a non-Google archive, visit here: 
http://www.mail-archive.com/jsmentors@googlegroups.com/

To unsubscribe from this group, send email to
jsmentors+unsubscr...@googlegroups.com