What is the difference between string::at and string::operator[]?

Question

I was taught string::at in school, but by exploring the string library I saw string::operator[], which I was never shown before.

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Answer 1

at does bounds checking, exception of type std::out_of_range will be thrown on invalid access.

operator[] does NOT check bounds and thus can be dangerous if you try to access beyond the bounds of the string. It is a little faster than at though.