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Showing content from https://webplatform.github.io/docs/javascript/Object/hasOwnProperty below:

hasOwnProperty · WebPlatform Docs

hasOwnProperty Summary

Determines whether an object has a property with the specified name.

Syntax

hasOwnProperty( proName )

proName: Required. String value of a property name.

Examples

In the following example, all String objects share a common split method. The following code will display false and true.

var s = new String("Sample");
 document.write(s.hasOwnProperty("split"));
 document.write("<br/>");
 document.write(String.prototype.hasOwnProperty("split"));

Remarks

The hasOwnProperty method returns true if object has a property of the specified name, false if it does not. This method does not check the properties in the object’s prototype chain; the property must be a member of the object itself.