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Difference between Select and ConvertAll in C#
...ons. The ConvertAll method runs through the list and creates a new list in one go, while the Select method uses lazy execution and only processes the items as you need them. If you don't need all the item, the Select method is more efficient. On the other hand, once ConvertAll has returned the list,...
multiprocessing: sharing a large read-only object between processes?
... has to read from many sources.
Reading from many named pipes is often done using the select module to see which pipes have pending input.
Solution 3
Shared lookup is the definition of a database.
Solution 3A – load a database. Let the workers process the data in the database.
Solution...
PowerShell equivalent to grep -f
... -Pattern parameter in Select-String supports an array of patterns. So the one you're looking for is:
Get-Content .\doc.txt | Select-String -Pattern (Get-Content .\regex.txt)
This searches through the textfile doc.txt by using every regex(one per line) in regex.txt
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Uint8Array to string in Javascript
...ript string (I believe Javascript uses 16 bit Unicode)? I dont want to add one character at the time as the string concaternation would become to CPU intensive.
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How do I address unchecked cast warnings?
...a solution for dealing with non-genericized legacy libraries, and there is one in particular called the "empty loop technique" in section 8.2. Basically, make the unsafe cast, and suppress the warning. Then loop through the map like this:
@SuppressWarnings("unchecked")
Map<String, Number> map...
What is difference between CrudRepository and JpaRepository interfaces in Spring Data JPA?
...context and deleting records in a batch.
Because of the inheritance mentioned above, JpaRepository will have all the functions of CrudRepository and PagingAndSortingRepository. So if you don't need the repository to have the functions provided by JpaRepository and PagingAndSortingRepository , use...
Getting the first character of a string with $str[0]
...d I'm pretty sure is much faster than the substr() method).
There is only one caveat with both methods: they will get the first byte, rather than the first character. This is important if you're using multibyte encodings (such as UTF-8). If you want to support that, use mb_substr(). Arguably, you s...
delete vs delete[] operators in C++
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If the standard doesn't define what happens when that is done, it is by definition "undefined behavior", even if your compiler deterministically does what you'd like it to do. Another compiler may do something entirely different.
– Rob K
Dec 23...
How can I override Bootstrap CSS styles?
... separate custom.css file instead of modifying bootstrap.css directly, one reason being that should bootstrap.css get an update, I'll suffer trying to re-include all my modifications. I'll sacrifice some load time for these styles, but it's negligible for the few styles I'm overriding.
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How to select rows with no matching entry in another table?
...application and I've discovered that, joy of joys, even though values from one table are being used in the style of foreign keys, there's no foreign key constraints on the tables.
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