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Create PostgreSQL ROLE (user) if it doesn't exist
...QL script to create a ROLE in PostgreSQL 9.1, but without raising an error if it already exists?
10 Answers
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Check if two unordered lists are equal [duplicate]
I'm looking for an easy (and quick) way to determine if two unordered lists contain the same elements:
8 Answers
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C# Test if user has write access to a folder
I need to test if a user can write to a folder before actually attempting to do so.
18 Answers
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How to check if an object is an array?
...rite a function that either accepts a list of strings, or a single string. If it's a string, then I want to convert it to an array with just the one item so I can loop over it without fear of an error.
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Best way to check for nullable bool in a condition expression (if …)
...d don't think about what they actually want :)
bool? nullableBool = true;
if (nullableBool == true) { ... } // true
else { ... } // false or null
Or if you want more options...
bool? nullableBool = true;
if (nullableBool == true) { ... } // true
else if (nullableBool == false) { ... } // false
e...
How to read/write from/to file using Go?
...nc main() {
// open input file
fi, err := os.Open("input.txt")
if err != nil {
panic(err)
}
// close fi on exit and check for its returned error
defer func() {
if err := fi.Close(); err != nil {
panic(err)
}
}()
// open output file...
Fastest way to tell if two files have the same contents in Unix/Linux?
...e same data or not. I do this a for a lot of files, and in my script the diff command seems to be the performance bottleneck.
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Test if object implements interface
What is the simplest way of testing if an object implements a given interface in C#? (Answer to this question
in Java )
1...
How to check if any flags of a flag combination are set?
...
If you want to know if letter has any of the letters in AB you must use the AND & operator. Something like:
if ((letter & Letters.AB) != 0)
{
// Some flag (A,B or both) is enabled
}
else
{
// None of them are...
How to check if a folder exists
...t this throws an exception when the folder does not exist, how can I check if the folder exists with the new IO?
10 Answer...