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I think it's hard to say how important are they for language xy.
Generally, you'll find library functions that do it all for you, so why even write it? But if you don't, you'll know that much less about coding...
I believe things like these are important for your development as a coder, and even (or especially) if a language serves them all to you on a silver platter, it may be a good idea to resist and to learn to do it with your own hands.