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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>JavaScript delete Operator</title> </head> <body> <pre> <!-- Use pre element for work document.writeln() method --> <script type="text/javascript"> var address = "63 street Ct."; document.writeln("address :", delete address); // Returns false, Using var keyword you can't delete add = "63 street Ct."; document.writeln("add :", delete add); // Returns true, explicit declare you can delete var myObj = new Object(); myObj.name = "Opal Kole"; myObj.age = 48; myObj.married = true; document.writeln("myObj.name :", delete myObj.name); // delete object property document.writeln("myObj['count']:", delete myObj["count"]); // delete object property var experience = [2010, 2011, 2012, 2013, 2014]; // array elements document.writeln("experience[2] :", delete experience[2]); // delete 2nd index from array elements document.writeln("experience :", experience); // [2010, 2011, undefined × 1, 2013, 2014] </script> </pre> </body> </html>