What does an exclamation mark mean in the Swift language?

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Peter Schneider
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What does an exclamation mark mean in the Swift language?
I hope you found a solution that worked for you :)
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(stackoverflow.com/users/1354350/troy)Troy
(stackoverflow.com/users/2047122/ashley)Ashley
(stackoverflow.com/users/2804731/amr)Amr
(stackoverflow.com/users/65694/alex-nolasco)Alex Nolasco
(stackoverflow.com/users/6694/ben-gottlieb)Ben Gottlieb
(stackoverflow.com/users/239816/paul-cantrell)Paul Cantrell
A special thanks goes out to the (stackoverflow.com/questions/24018327/what-does-an-exclamation-mark-mean-in-the-swift-language)Stackexchange community

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