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// The module pattern
var feature = (function() {
 
    // Private variables and functions
    var privateThing = "secret";
    var publicThing = "not secret";
 
    var changePrivateThing = function() {
        privateThing = "super secret";
    };
 
    var sayPrivateThing = function() {
        console.log( privateThing );
        changePrivateThing();
    };
 
    // Public API
    return {
        publicThing: publicThing,
        sayPrivateThing: sayPrivateThing
    };
})();
 
feature.publicThing; // "not secret"
 
// Logs "secret" and changes the value of privateThing
feature.sayPrivateThing();