大约有 23,000 项符合查询结果（耗时：0.0392秒） [XML]
What does the ^ operator do in Java?
...nother question where the intention was to use exponentiation to convert a string "8675309" to int without using Integer.parseInt as a programming exercise (^ denotes exponentiation from now on). The OP's intention was to compute 8*10^6 + 6*10^5 + 7*10^4 + 5*10^3 + 3*10^2 + 0*10^1 + 9*10^0 = 867530...
Extract a dplyr tbl column as a vector
... How would I do this if I want to pass not the colname itself but a string variable that contains it?
– mzuba
Aug 7 '17 at 22:16
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jQuery - setting the selected value of a select control via its text description
I have a select control, and in a javascript variable I have a text string.
21 Answers
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Ruby - test for array
...'abc'.size both work, but 'abc'.count doesn't work like that).
Caution: a string is_a? Enumerable, so perhaps this isn't what you want... depends on your concept of an array like object.
share
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im...
How to determine programmatically whether a particular process is 32-bit or 64-bit
... Console.WriteLine(p.ProcessName + " is " + (p.IsWin64Emulator() ? string.Empty : "not ") + "32-bit");
}
catch (Win32Exception ex)
{
if (ex.NativeErrorCode != 0x00000005)
{
throw;
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How to get a group of toggle buttons to act like radio buttons in WPF?
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If a add content other then a simple string i get a "Element is already the child of another element." error. Is there a way arround this?
– Tobias Hoefer
Jul 21 '15 at 12:49
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How to rename with prefix/suffix?
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what if "from" or "to" are empty strings, i.e. you want to append something to each filename or remove something completely
– Troyseph
Oct 4 '19 at 14:51
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Why is a C++ Vector called a Vector?
...rdered sequence of values could apply to std::list, std::deque, std::basic_string, etc.
– jamesdlin
Jun 27 '17 at 10:23
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How do I modify the URL without reloading the page?
... The first parameter is expected to be an object, not just a string.
– Alexis Wilke
Jun 4 '16 at 4:23
47
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How to check if IEnumerable is null or empty?
I love string.IsNullOrEmpty method. I'd love to have something that would allow the same functionality for IEnumerable. Is there such? Maybe some collection helper class? The reason I am asking is that in if statements the code looks cluttered if the patter is (mylist != null && mylist....