What does "out of the blue" mean?

[woorazilboy]

in page 23,
Using Swift requires much more typing. In addition, when stopping the debugger out of the blue, or on Objective-C code, LLDB will default to Objective-C.

and page 74,
You stopped the debugger out of the blue! Remember, LLDB will default to Objective-C; you’ll need to use the -l option to stay in the Swift context:

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I don’t understand what is the “out of the blue”
How can i check this in Xcode?

[myst]

As far as I can see here, this is just an expression meaning “suddenly, without warning”. I do not think it has technical connotations. I do not think I have heard this expression in a long while though. It was kind of cool.

Peace, Myst

[gdelarosa]

Hi @woorazilboy! Like myst mentioned, “out of the blue” is an informal expression that generally means an event that occurs unexpectedly. Happy coding!

Best,
Gina

[stan]

‘Stopping the debugger out of the blue’ means stopping by pressing the ‘pause program execution’ button in Xcode. I guess