What is a specific instance of a host object that simultaneously functions as a native object within JavaScript?

An object classified as native is one that is defined by the ECMAScript standards, such as arrays, functions, dates, and regular expressions. On the other hand, a host object is defined by the environment in which the JavaScript interpreter operates, like a web browser. Host objects can also be considered native if they define methods that are standard JavaScript Function objects.

How is it possible for a host object, dictated by its environment, to be categorized as native, based on the specification? Can you provide an example of these methods?

javascript

Answer №1

ES5 defines the concepts of native objects, built-in objects, and host objects:

Native object refers to objects in an ECMAScript implementation whose behavior is defined by the specification rather than the host environment.

Built-in objects are provided by the ECMAScript implementation at the start of program execution, independent of the host environment.

Host objects come from the host environment to enhance the ECMAScript execution environment.

The distinction between these types of objects can sometimes be unclear. It seems that native objects are not considered as host objects, but this interpretation may vary.

In the ES2015 update, the terminology shifts slightly. The term "native object" is no longer used, and instead, the focus is on built-in objects and the host environment.

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