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In C#, What is a monad?
...ealize I’ve actually written some things in C# that are Monads … or at least very close, and striving to solve the same problems.
So, here’s the comment – this is all a direct quote from the comment here by sylvan:
This is pretty cool. It's a bit abstract though. I can imagine people
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What is 'Pattern Matching' in functional languages?
...ompact syntax, it enables the compiler to check the logic of your code, at least a little bit. It really is a killer feature.
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Check Whether a User Exists
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You can also check user by id command.
id -u name gives you the id of that user.
if the user doesn't exist, you got command return value ($?)1
And as other answers pointed out: if all you want is just to check if the user exists, use if with id directl...
How to get an array of specific “key” in multidimensional array without looping
Let's assume I have the following multidimensional array (retrieved from MySQL or a service):
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Sequence contains no elements?
...point on that line, or a Debug.Print before it, in both cases and see what ID contains.
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Create dynamic URLs in Flask with url_for()
...lot o stuff with it, for example:
@app.route('/questions/<int:question_id>'): #int has been used as a filter that only integer will be passed in the url otherwise it will give a 404 error
def find_question(question_id):
return ('you asked for question{0}'.format(question_id))
For t...
how to get last insert id after insert query in codeigniter active record
...he form fields into a MySQL table. I want to get the last auto-incremented id for the insert operation as the return value of my query but I have some problems with it.
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SQL Server - Return value after INSERT
...INSERT-statement.
Example:
I've got a table with the attributes name and id. id is a generated value.
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python list in sql query as parameter
....join(placeholder for unused in l)
query= 'SELECT name FROM students WHERE id IN (%s)' % placeholders
cursor.execute(query, l)
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How do I configure Maven for offline development?
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Also consider you can use "mvn dependency:go-offline" to ensure all the dependencies referred to in your pom.xml are present in your local repository.
– Thorbjørn Ravn Andersen
May 3 '14 at 16:0...