Null object: Difference between revisions

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m (→‎{{header|ooRexx}}: upperclass -> uppercase :-))
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=={{header|JavaScript}}==
In Javascript null is the value that isn't anything. null is an object.
<lang javascript>if (object !== undefined)
<lang javascript>if alert("object is=== defined"null)</lang> {
alert("object is null");
}
 
typeof null === 'object'; // This stands since the beginning of JavaScript</lang>
 
=={{header|K}}==
Retrieved from "https://rosettacode.org/wiki/Null_object"