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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Javascript Getter and Setter Functions</title> </head> <body> <script> var getValue, setValue; // Self-executing function (function() { var secret = 0; // Getter function getValue = function() { return secret; }; // Setter function setValue = function(x) { if(typeof x === "number") { secret = x; } }; }()); // Calling the functions alert(getValue()); // Returns: 0 alert(setValue(10)); alert(getValue()); // Returns: 10 alert(setValue(null)); alert(getValue()); // Returns: 10 </script> </body> </html>