An adventure in sparse arrays

I offered to coach JavaScript recently, and an exercise I dreamt up was to implement every array (prototype) method, and write tests that they work. Since I'd come down with tonsillitis which apparently comes with a full on bedridden fever, I thought I'd have a go myself. And I learnt a few things along the way. Today, I wanted to share the swiss cheese wonder of sparse arrays! (see what I did the

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JavaScriptの配列におけるsparse array(疎の配列)についての記事。 配列に穴があるときに、ループやメソッドなど列挙する際の扱いなどについて