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Counting the occurrences / frequency of array elements
... demo: http://jsfiddle.net/simevidas/bnACW/
Note
This changes the order of the original input array using Array.sort
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Validating IPv4 addresses with regexp
...ress. Anyone that wishes to edit this answer, please comment first here in order to avoid problems like these - I usually reply pretty fast. Always looking for a shorter/better solution of course.
– Danail Gabenski
Dec 25 '19 at 6:16
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Rotating a two-dimensional array in Python
...breakdown:
[::-1] - makes a shallow copy of the original list in reverse order. Could also use reversed() which would produce a reverse iterator over the list rather than actually copying the list (more memory efficient).
* - makes each sublist in the original list a separate argument to zip() (i....
What is exactly the base pointer and stack pointer? To what do they point?
... are pushed onto the stack by the calling function (usually in the reverse order that they're declared in the function prototype, but this varies). Then the function is called, which pushes the return address (EIP) onto the stack.
Upon entry to the function, the old EBP value is pushed onto the sta...
General guidelines to avoid memory leaks in C++ [closed]
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@Shiftbit: Three ways, in order of preference: _ _ _ 1. Put real object inside the STL container. _ _ _ 2. Put smart pointers (shared_ptr) of objects inside the STL container. _ _ _ 3. Put raw pointers inside the STL container, but wrap the container ...
Select random lines from a file
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If you just need a random set of lines, not in a random order, then shuf is very inefficient (for big file): better is to do reservoir sampling, as in this answer.
– petrelharp
Sep 6 '15 at 23:24
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How to set Sqlite3 to be case insensitive when string comparing?
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b
sqlite> select Text_Value from Test order by Text_Value;
Text_Value
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A
b
C
sqlite> select Text_Value from Test order by Text_Value desc;
Text_Value
----------------
C
b ...
In Scala how do I remove duplicates from a list?
..., but be aware that by default, the Set interface doesn't preserve element order. You may want to use a Set implementation that explicitly does preserve order, such as collection.mutable.LinkedHashSet.
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Accessing class variables from a list comprehension in the class definition
...[i for i in range(1) for j in range(x)]
This design decision was made in order to throw an error at genexp creation time instead of iteration time when creating the outermost iterable of a generator expression throws an error, or when the outermost iterable turns out not to be iterable. Comprehens...
What is a proper naming convention for MySQL FKs?
...rom KEY_COLUMN_USAGE where REFERENCED_TABLE_SCHEMA = 'your_db_schema_name' ORDER BY TABLE_NAME;
For example you might receive the following from the query:
+------------+-------------+-----------------+-----------------------+------------------------+
| TABLE_NAME | COLUMN_NAME | CONSTRAINT_NAME ...