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Why does String.valueOf(null) throw a NullPointerException?
... that the most specific method is chosen.
A char[] is-an Object, but not all Object is-a char[]. Therefore, char[] is more specific than Object, and as specified by the Java language, the String.valueOf(char[]) overload is chosen in this case.
String.valueOf(char[]) expects the array to be non-nu...
How can I efficiently select a Standard Library container in C++11?
... a member function rather than the one from <algorithm>. As for O(1) vs O(log n), it does not affect semantics; I'll remove the "efficiently" from the example and replace it with "easily".
– Matthieu M.
May 22 '12 at 12:22
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What are WSGI and CGI in plain English?
...ther WSGI or CGI I cringe. I've tried reading on it before but nothing really has stuck.
4 Answers
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How is Docker different from a virtual machine?
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Docker originally used LinuX Containers (LXC), but later switched to runC (formerly known as libcontainer), which runs in the same operating system as its host. This allows it to share a lot of the host operating system resources. Also, i...
What does iota of std::iota stand for?
...ase Greek letter iota.
In the quote above, I typed ι, U+03B9, “GREEK SMALL LETTER IOTA”, but Unicode actually has a dedicated code point for APL's iota: ⍳ is U+2373, “APL FUNCTIONAL SYMBOL IOTA”.
In response to the demands of commenters, I shall further address the etymology of “iot...
Injecting $scope into an angular service function()
...table stuff), but is a Scope object. Many scope objects can be created (usually prototypically inheriting from a parent scope). The root of all scopes is the $rootScope and you can create a new child-scope using the $new() method of any scope (including the $rootScope).
The purpose of a Scope is t...
Single Page Application: advantages and disadvantages [closed]
...pages.
The number of pages user downloads during visit to my web site?? really how many mails some reads when he/she opens his/her mail account. I read >50 at one go. now the structure of the mails is almost the same. if you will use a server side rendering scheme the server would then render it...
Difference between os.getenv and os.environ.get
Is there any difference at all between both approaches?
5 Answers
5
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get all characters to right of last dash
... will only fail if either str is null or if it doesn't contain a hyphen at all. (In the case where there's no hyphen it doesn't throw; it returns the entire source string.)
– LukeH
Mar 16 '11 at 15:31
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Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
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[[ has fewer surprises and is generally safer to use. But it is not portable - POSIX doesn't specify what it does and only some shells support it (beside bash, I heard ksh supports it too). For example, you can do
[[ -e $b ]]
to test whether a file exists....