Differences Between Javascript Objects and JScript Dictionaries

When it comes to Javascript Objects and JScript Dictionaries, both are considered associative arrays.

obj = new Object ;
dic = new ActiveXObject("Scripting.Dictionary") ;

My main inquiry is whether there are any differences between them in efficiency, whether it be in terms of space or time. Functionality-wise, I understand that a Dictionary has the upper hand due to its ability to support more than just scalar types as keys. However, setting that aside, which one would be considered better or faster?

EDIT:
Just to clarify, this question pertains to Windows scripting rather than web development.

EDIT2:
I am specifically interested in the lookup efficiency, as I will be working with large collections.

javascriptscriptingassociative-arrayjscriptwsh

Answer №2

The Scripting.Dictionary component is a versatile tool that can be implemented in various MS scripting languages.

However, caution should be exercised when utilizing it due to the potential slowness associated with each access call to the COM component.

If its features are essential to your project, feel free to incorporate it, but be mindful that it is only compatible with Internet Explorer.

Answer №3

When working with Javascript, it's important to remember that Javascript objects are built into the execution engine. On the other hand, Scripting.Dictionary is a COM object that requires interop calls for every operation.

Typically, I would recommend sticking with the in-engine type in javascript, unless there is a specific need for using a COM object with strong equality semantics for lookups.

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