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Why do python lists have pop() but not push()
...s, for stacks implemented directly as Python lists, which already supports fast append(), and del list[-1], it makes sense that list.pop() work by default on the last element. Even if other languages do it differently.
Implicit here is that most people need to append to a list, but many fewer have ...
Use LINQ to get items in one List, that are not in another List
...lso use:
peopleList2.Except(peopleList1)
Except should be significantly faster than the Where(...Any) variant since it can put the second list into a hashtable. Where(...Any) has a runtime of O(peopleList1.Count * peopleList2.Count) whereas variants based on HashSet<T> (almost) have a runti...
Determine the number of lines within a text file
...o allocate a massive chunk of memory. I'd guess that ReadAllLines might be faster for small files, but significantly slower for large files; though the only way to tell would be to measure it with a Stopwatch or code profiler.
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What does a type followed by _t (underscore-t) represent?
... of extra types, such as uintptr_t, intmax_t, int8_t, uint_least16_t, uint_fast32_t, and so on. These new types are formally defined in <stdint.h> but most often you will use <inttypes.h> which (unusually for standard C headers) includes <stdint.h>. It (<inttypes.h>) also d...
SQL Call Stored Procedure for each Row without using a cursor
...LOCAL option for a CURSOR and it will be destroyed upon failure. Use LOCAL FAST_FORWARD and there are almost zero reasons not to use CURSORs for these kind of loops. It would definitely outperform this WHILE loop.
– Martin
Apr 11 '19 at 7:40
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How can I check if an ip is in a network in Python?
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Nice and fast. No need for a library for a few simple logic operations.
– Chris Koston
Jun 7 '18 at 13:25
add...
How do you iterate through every file/directory recursively in standard C++?
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A fast solution is using C's Dirent.h library.
Working code fragment from Wikipedia:
#include <stdio.h>
#include <dirent.h>
int listdir(const char *path) {
struct dirent *entry;
DIR *dp;
dp = opendir...
How to download HTTP directory with all files and sub-directories as they appear on the online files
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worked perfectly and really fast, this maxed out my internet line downloading thousands of small files. Very good.
– n13
Jun 27 at 19:47
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SQL “select where not in subquery” returns no results
...n commonID, you get a table scan but @patmortech's query is still twice as fast (for a 100K row master table).
If neither are indexed on commonID, you get two table scans and the difference is negligible.
If both are indexed on commonID, the "not exists" query runs in 1/3 the time.
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'AND' vs '&&' as operator
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As PHP is an interpreted language it will run fast if you don't use unnecessary whitespaces or new lines on your code. If you do the same on a compiled language it only will take more time to compile but it will not take effect on runtime. I don't mean doing it once will...