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Discussion on: In-Place Algorithms; what are they, and why use them?

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Hector Minaya

Not everything is as it seems, in Ruby you can add elements dynamically to an array, which in reality just creates a new Array (based on the new size) and may keep the old one around until the garbage collector disposes of it.

Even JS has the ability to add/remove elements from an Array, because it's actually not an Array. It's a dictionary with an integer key and an object as it's value.