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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>JavaScript NULL</title> </head> <body> <pre> <!-- Use pre element for work document.writeln() method --> <script type="text/javascript"> var str = null; // Value assign null document.writeln("str == undefined : " , str == undefined); document.writeln("null == undefined : " , null == undefined); document.writeln("null === undefined : " , null === undefined); var bool = Boolean(); document.writeln("Default Boolean Context : ", bool); // Default Boolean context Returns false var bool = Boolean(true); document.writeln("True Boolean : ", bool); // Returns true </script> </pre> </body> </html>