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Validate that a string is a positive integer
...r 9,007,199,254,740,992; for instance, 1234567890123456789 will fail). The former is an easy fix, the latter two not so much.
Regular Expression
The other approach is to test the characters of the string via a regular expression, if your goal is to just allow (say) an optional + followed by either...
Applicatives compose, monads don't
... Is it true, that for any monads m and n you can always write a monad transformer mt, and operate in n (m t) using mt n t? So you can always compose monads, it is just more complicated, using transformers?
– ron
Jun 19 '12 at 11:11
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Possible reason for NGINX 499 error codes
...cial case, I noticed it sometimes happen when the end-user double-clicks a form submit button. The form is sent twice, but only one response is expected by the client. This can be worked around by disabling (at least for a few seconds) buttons in JS the first time they get clicked.
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Difference between except: and except Exception as e: in Python
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It is also worth noting that the second form should only be used if you do not care about what the exception was or wish to handle it in a meaningful way.
– Josh J
Apr 26 '19 at 20:47
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How to trigger event when a variable's value is changed?
...t the event has been raised or in case that you are dealing with a Windows Form you can use a BackgourndWorker to do things in a parallel thread nice and easy.
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Is there any NoSQL data store that is ACID compliant?
...ata sets it provides interesting opportunities to deal with volumes and performance.
ACID provides principles governing how changes are applied to a database. In a very simplified way, it states (my own version):
(A) when you do something to change a database the change should work or fail as a w...
How to exclude certain directories/files from git grep search
...n do:
git grep foobar -- './*' ':(exclude)*.java'
Or using the ! "short form" for exclude:
git grep foobar -- './*' ':!*.java'
Note that in git versions up to v2.12, when using an exclude pathspec, you must have at least one "inclusive" pathspec. In the above examples this is the ./* (recursiv...
What is the difference between CMD and ENTRYPOINT in a Dockerfile?
...default there's no ENTRYPOINT; whether a shell is used depends on the used form of the CMD command (docs.docker.com/engine/reference/builder/#cmd).
– Blaisorblade
Jan 13 '16 at 22:29
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CASCADE DELETE just once
... aren't set up with the ON DELETE CASCADE rule. Is there any way I can perform a delete and tell Postgresql to cascade it just this once? Something equivalent to
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Extract elements of list at odd positions
...he end is just a notation for list slicing. Usually it is in the following form:
some_list[start:stop:step]
If we omitted start, the default (0) would be used. So the first element (at position 0, because the indexes are 0-based) would be selected. In this case the second element will be selected...