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How to check if a string is a valid date
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The ambiguity that prevents you from validating the date only does so to the extent that it also prevents you from parsing the date, but you've made a good attempt at parsing it with known information. It would be nice to use some of what you have to try to...
How to print to console when using Qt
...function that Qt provides for sending output to stderr that can be removed from compilation with a define. So it is an alternative for achieving output to the console at runtime.
– Arnold Spence
Oct 7 '10 at 23:23
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Facebook Android Generate Key Hash
...generate key hash you need to follow some easy steps.
1) Download Openssl from: here.
2) Make a openssl folder in C drive
3) Extract Zip files into this openssl folder created in C Drive.
4) Copy the File debug.keystore from .android folder in my case (C:\Users\SYSTEM.android) and paste into JD...
Type definition in object literal in TypeScript
...de Pattern as Alternative)
After many years of using const and benefiting from more functional code, I would recommend against using the below in most cases. (When building objects, forcing the type system into a specific type instead of letting it infer types is often an indication that something ...
getActivity() returns null in Fragment function
...s. The onAttach call is where the Fragment is attached to its activity and from this point getActivity() will return non-null (nb there is also an onDetach() call).
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Equivalent of “throw” in R
...sting" parts in R is probably related to that a lot of conventions differs from other languages, notably the C-language family that it is syntactically close too. I would guess because the language was evolved by a bunch of statisticians that needed a good tool, rather than developers needing a good...
Foreign keys in mongo?
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Ok, but how can I get cource name data from student collection? db.student.find() will return something like courses: [ { course: 'bio101', mark: 85 } ]
– Mark Pegasov
Jun 13 '11 at 18:09
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What is the purpose of “&&” in a shell command?
...the || which is an OR_IF with similar semantics.
Grammar symbols, quoted from the documentation:
%token AND_IF OR_IF DSEMI
/* '&&' '||' ';;' */
And the Grammar (also quoted from the documentation), which shows that any number of AND_IFs (&&) and/or OR_I...
Storing Python dictionaries
...o write to a file:
import json
myfile.write(json.dumps(mydict))
To read from a file:
import json
mydict = json.loads(myfile.read())
myfile is the file object for the file that you stored the dict in.
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How can I cast int to enum?
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From an int:
YourEnum foo = (YourEnum)yourInt;
From a string:
YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);
// The foo.ToString().Contains(",") check is necessary for enumerations marked with an [Flags...