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Mimicking sets in JavaScript?
...h is small code that implements the basics of a set object. It also has a more feature rich set object and several derivations including a Dictionary (let's you store/retrieve a value for each key) and an ObjectSet (let's you keep a set of objects - either JS objects or DOM objects where you either...
Should I pass an std::function by const-reference?
...e are forced to copy the std::function.
That store makes passing by value more optimal. If there is any possibility you are storing a copy of the std::function, pass by value. Otherwise, either way is roughly equivalent: the only downside to by-value is if you are taking the same bulky std::funct...
Uses for Optional
...atches use case #1 in the OP's question. Although, absence of a value is a more precise formulation than null since something like IntStream.findFirst could never return null.
For use case #2, passing an optional argument to a method, this could be made to work, but it's rather clumsy. Suppose you ...
The remote end hung up unexpectedly while git cloning
...ng to double the value):
git config --global http.postBuffer 1048576000
More information:
From the git config man page, http.postBuffer is about:
Maximum size in bytes of the buffer used by smart HTTP transports when POSTing data to the remote system.
For requests larger than this buffer s...
Changing API level Android Studio
...ing any references to SDK levels in the manifest file, is NOT necessary anymore in Android Studio.
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Difference between abstract class and interface in Python
...ror("Class %s doesn't implement aMethod()" % (self.__class__.__name__)) is more informative error message :)
– naught101
Sep 3 '14 at 1:43
9
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How do I modify fields inside the new PostgreSQL JSON datatype?
...one for json; casts are required to manipulate json values).
Merging 2 (or more) JSON objects (or concatenating arrays):
SELECT jsonb '{"a":1}' || jsonb '{"b":2}', -- will yield jsonb '{"a":1,"b":2}'
jsonb '["a",1]' || jsonb '["b",2]' -- will yield jsonb '["a",1,"b",2]'
So, setting a simple...
How to remove/ignore :hover css style on touch devices
...uld suggest either splitting the rules or using the 2nd solution, which is more robust anyway. However, you're very welcome to suggest an edit, if you can improve the first solution without making it too complicated.
– blade
Jun 15 '17 at 14:44
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How to randomly select an item from a list?
...
If you want to randomly select more than one item from a list, or select an item from a set, I'd recommend using random.sample instead.
import random
group_of_items = {1, 2, 3, 4} # a sequence or set will work here.
num_to_select = 2 ...