brief closure demonstration

greetings.js

var greet = function(greeting) {
    var full_greeting = greeting+', ';
    var greet_name = function(name) {
        console.log(full_greeting + name);
    }
    return greet_name;
}

var hello = greet('hello'); // builds a greeting function, prints nothing
hello('stephen');   // does the actual printing

var guttentag = greet('guttentag');
guttentag('sarah');