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Pick a random element from an array
...t(arc4random_uniform(UInt32(array.count)))
print(array[randomIndex])
The castings are ugly, but I believe they're required unless someone else has another way.
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Choosing the default value of an Enum type without having to change values
...value of (Staus) 0. The latter is valid to write directly, as enums can be cast to integers, but it will fail during deserialization, as the framework makes sure that an enum is always deserialized to a valid member. Your code will be perfectly valid if you change the line New = 10 to New = 0.
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How to check for an undefined or null variable in JavaScript?
...s the truthiness. Which FYI is also equivalent to if (var) which will be cast to boolean, so basically completely useless...
– Cyril CHAPON
Jun 26 '18 at 9:42
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Worth switching to zsh for casual use? [closed]
...ranted. It would be really nice if it auto-completed more stuff , though, and I've heard good things about zsh in this regard. But I don't really have the inclination to spend hours fiddling with settings to improve my command line usage by a tiny amount, since my life on the command line isn't t...
adb server version doesn't match this client
...robably came out because ADB from Genymotion conflicted with your ADB from Android SDK(using same port number), to fix this simply go to settings => choose ADB tab => click on the option Use custom Android SDK Tools and set your SDK folder
after you configure this, try to restart your adb b...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...是一篇介绍如何在x86架构上详细地实现异常处理(exception handling)的手册，只是一篇入门的讨论性文章。本文只是讨论一些处理步骤在理论上应该如何实现，其具体的实现步骤可能跟文章所讨论的并不一致。原文译自：http://www.codep...
How to join strings in Elixir?
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"my name is "
Also consider types. With <> you don't get any free casting:
iex(5)> "my name is " <> 1
** (ArgumentError) expected binary argument in <> operator but got: 1
(elixir) lib/kernel.ex:1767: Kernel.wrap_concatenation/3
(elixir) lib/kernel.ex:1758: Kernel.ex...
How do I update a Linq to SQL dbml file?
... I had tried 1a and 1c without 1b and was getting 'Specified cast is not valid' errors when performing a simple select on a view. Including 1b fixed it for me
– tomfumb
Nov 29 '11 at 19:40
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@selector() in Swift?
...unction has no parameters, the only way to disambiguate it is to use an as cast with the function's type signature (e.g. foo as () -> () vs foo(_:)).
There's a special syntax for property getter/setter pairs in Swift 3.0+. For example, given a var foo: Int, you can use #selector(getter: MyClass.f...
system(“pause”); - Why is it wrong?
Here's a question that I don't quite understand:
13 Answers
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