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<How ECMAScript 5 still does not allow to subclass an array ⁄ >




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Subclassing an array in Javascript has never been a trivial task. At least for a certain meaning of "subclassing an array". Curiously, new edition of the language - ECMAScript 5 - still does not allow to fully subclass an array.

Not everything is lost though, and there are few ways ECMAScript 5 makes this task closer to the ideal. However, there are few fundamental issues which prevent true array subclassing from happening.

Let's talk about that.

Today we'll take a look at what it means to subclass an array, what some of the existing implementations/workarounds are, and which drawbacks those implementations have; We'll see what ECMAScript 5 brings to the table, and what those fundamental issues with subclassing are. We'll also talk about alternative approaches to subclassing an array, such as using wrappers, and get to know their limitations.

But first, what does it mean to subclass an array? And why do we even need it?



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