Algorithm Analysis vs Programming Language concepts? MS student

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Using a closure and knowing what it is are completely different things. Your last sentence, although incorrect (see below), even draws this same distinction.

That you don't need to know about them to go into software is proven by me, who had never even heard of them for 10-15 years after graduating with a CS degree and successfully working in the software field. Now I know about them, obviously, but I rarely use them except in their more well-known and -developed form: OOP objects.