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<!DOCTYPE html> <html> <body> <h2>JavaScript Booleans</h2> <p>Return "green" if a boolean value is true, otherwise display "red":</p> <p id="demo"></p> <script> Boolean.prototype.myColor = function() { if (this.valueOf() == true) { return "green"; } else { return "red"; } }; let a = true; document.getElementById("demo").innerHTML = a.myColor(); </script> </body> </html>
