eval.js

#!/usr/local/bin/node

var not = {};

function printCatch (name) {
    try {
        console.log(eval(name));
    } catch (e) {
        console.log("whoops, that isn't defined yet");
        setTimeout(printCatch.bind(undefined, name), 0);
    }   
}

printCatch('not.def.yet');

not = {
    def: {
        yet: "boo yah"
    }
};