Closures

gistfile1.js

// given:

var sayHello = function (name) {
  var text = 'Hello, ' + name;
  return function () {
    console.log(text);
  };
};

// this does not work:
sayHello('Rex');

//this does:
var helloTodd = sayHello('Rex');
helloTodd(); // returns "Hello, Todd"

// why?