Indeed, it's not directly related, perhaps misunderstanding, but I'm just drawing the similar idea between the two situations of not taking memory first. If you slice, you make a copy and that takes space. So, the space complexity is no longer O(1). It's just that, not that it has any direct relation to map() function. Perhaps a generator is a better analogy to use in the first place because a generator does not make a whole list first, it does not take up as much space upon creation.
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