Apple27

can someone please explain that to me ?

DaWei

When an error occurs, you detect it and do something useful, if you can. You won't know they occurred if you don't check the things you use, of course. Most things don't promise to work -- they promise to work or tell you they failed. Basic lesson number one: read the documentation for the things that you use and see what they say about when they fail.

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Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code.
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