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Asked: 2026-05-25T21:24:37+00:00

I don’t understand the difference between native objects and host objects in JavaScript. Does

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I don’t understand the difference between native objects and host objects in JavaScript. Does the latter simply refer to non-primitive function objects that were created by a custom constructor (e.g., var bird1 = new Bird();)?

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  1. Editorial Team

    Both terms are defined in the ECMAScript specification:

    native object

    object in an ECMAScript implementation whose semantics are fully
    defined by this specification rather than by the host environment.

    NOTE Standard native objects are defined in this specification. Some
    native objects are built-in; others may be constructed during the
    course of execution of an ECMAScript program.

    Source: http://es5.github.com/#x4.3.6

    host object

    object supplied by the host environment to complete the
    execution environment of ECMAScript.

    NOTE Any object that is not native is a host object.

    Source: http://es5.github.com/#x4.3.8

    A few examples:

    Native objects: Object (constructor), Date, Math, parseInt, eval, string methods like indexOf and replace, array methods, …

    Host objects (assuming browser environment): window, document, location, history, XMLHttpRequest, setTimeout, getElementsByTagName, querySelectorAll, …

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