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I tried putting exit(0) in a small test (command-line) program. Xcode gave an error message stating Use of unresolved identifier 'exit'. This was confusing to me, since this question seemed to show exit() works. After combing through "The Swift Programming Language" I couldn't find any mention of an exit keyword/command. So how do you explicitly halt execution in Swift?
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exit() Terminates the current thread.
exit() is for normal termination, and allows you to provide a return code. abort() is for when something has gone wrong. It's basically forcing a crash.
In Swift, the break statement is used to immediately end the execution of a loop, a switch statement, an if statement of a do statement. As such, the break statement consists of a single break keyword followed optionally by a (you guessed it) statement label!
The exit function isn't a keyword or built-in in C or Objective-C either. It's a library function. In Swift, you can access it by importing Darwin:
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