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In .NET, which loop runs faster, 'for' or 'foreach'?
...wer in general, but foreach becomes significantly slower than accessing by index. Having said that, I would still almost always prefer foreach to a for loop where it makes the code simpler - because readability is almost always important, whereas micro-optimisation rarely is.
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NB: In Windows, + and * are equivalent see this answer.
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How do you reinstall an app's dependencies using npm?
...rsions of dependencies defined in package.json being pulled down. If you require very specific versions of dependencies for your app, be careful and look into npm shrinkwrap or checking in your node_modules directory to source control.
– smithclay
Oct 12 '12 at...
Why does range(start, end) not include end?
...s which equals len(range(0, 10)). Remember that programmers prefer 0-based indexing.
Also, consider the following common code snippet:
for i in range(len(li)):
pass
Could you see that if range() went up to exactly len(li) that this would be problematic? The programmer would need to explicitl...
How to use LINQ to select object with minimum or maximum property value
...re consistent with methods like First() and the approach of the Dictionary indexer. You could easily adapt it if you wanted though.
– Jon Skeet
May 27 '09 at 6:40
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How to Generate unique file names in C#
...upplied. If the original file exists, it incrementally tries to append an index to the filename until it finds one that doesn't exist. It reads the existing filenames into a HashSet to check for collisions so it's pretty quick (a few hundred filenames per second on my machine), it's thread safe to...
Renaming the current file in Vim
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Q: "what kind of sociopathic weirdo puts spaces in the dir name?" -- A: the guy who started the project long ago who is now your boss... promoted out of coding into his true area of expertise: following development methodolog...
Diff files present in two different directories
... you are only interested to see the files that differ, you may use:
diff -qr dir_one dir_two | sort
Option "q" will only show the files that differ but not the content that differ, and "sort" will arrange the output alphabetically.
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Finding last occurrence of substring in string, replacing that
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@AdamMagyar yes, container[a:b] slices from a up to b-1 index of the container. If 'a' is omitted, then it defaults to 0; if 'b' is omitted it defaults to len(container). The plus operator just concatenates. The rfind function as you pointed out returns the index around which the ...
SQL Joins Vs SQL Subqueries (Performance)?
...THINGS SQL though, your mileage may vary. The speed will depend a lot on indexes (do you have indexes on both ID columns? That will help a lot...) among other things.
The only REAL way to tell with 100% certainty which is faster is to turn on performance tracking (IO Statistics is especially use...