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What is the purpose of a question mark after a type (for example: int? myVariable)?
Typically the main use of the question mark is for the conditional, x ? "yes" : "no" .
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How can I convert a DateTime to the number of seconds since 1970?
I'm trying to convert a C# DateTime variable to Unix time, ie, the number of seconds since Jan 1st, 1970. It looks like a DateTime is actually implemented as the number of 'ticks' since Jan 1st, 0001.
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How to mkdir only if a directory does not already exist?
I am writing a shell script to run under the KornShell (ksh) on AIX. I would like to use the mkdir command to create a directory. But the directory may already exist, in which case I do not want to do anything. So I want to either test to see that the directory does not exist, or suppress the "Fil...
PHP array delete by value (not key)
I have a PHP array as follows:
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How can I undo git reset --hard HEAD~1?
Is it possible to undo the changes caused by the following command? If so, how?
18 Answers
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Take a char input from the Scanner
I am trying to find a way to take a char input from the keyboard.
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Best way to get application folder path
I see that there are some ways to get the application folder path:
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Get index of array element faster than O(n)
Given I have a HUGE array, and a value from it. I want to get index of the value in array. Is there any other way, rather then call Array#index to get it? The problem comes from the need of keeping really huge array and calling Array#index enormous amount of times.
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Pretty-print C++ STL containers
Please take note of the updates at the end of this post.
10 Answers
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How to remove an element from an array in Swift
How can I unset/remove an element from an array in Apple's new language Swift?
18 Answers
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