Does not rely on len() to check whether the initialized slice is empty

Question content

I have a use case where the built-in len() function is not suitable for checking if the initialized (non-zero) slice is empty.

How to safely check if a slice is empty without len()?

I try to index the first element, however, if it doesn't exist, my program panics.

Workaround

There is absolutely no reason not to use len(), so just use len since len is an O(1) operation .

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