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Difference between Select and ConvertAll in C#
...1) ConvertAll knows the size of the final list and avoids reallocating the base array. ToList() will keep resizing the array multiple times.
2) ToList will make slower interface IEnumerable<> calls, while ConvertAll will loop through the underlying array without extra calls or range checks.
...
How to check if std::map contains a key without doing insert?
... Sure, I understand that the OP doesn't care to insert, so a lower_bound-based solution is overkill. I kind of just mentioned my answer "for completeness"; like I said, yours is perfectly adequate. :-)
– Chris Jester-Young
Oct 7 '10 at 23:29
...
How to make a HTML Page in A4 paper size page(s)?
...{
size: 7in 9.25in;
margin: 27mm 16mm 27mm 16mm;
}
Having a US-based publisher, we were given the page size in inches. We, being Europeans, continued with metric measurements. CSS accepts both.
After setting the up the page size and margin, we needed to make sure there are page brea...
When should I use the assets as opposed to raw resources in Android?
...s in the assets folder is slower since you will need to get a handle to it
based on a String. However some operations are more easily done by
placing files in this folder, like copying a database file to the
system’s memory. There’s no (easy) way to create an Android XML
reference to files insid...
Why {} + {} is NaN only on the client side? Why not in Node.js?
...ed it and found it helpful, but I owe it to my familiarity with these code bases (dev-tools and nodejs) rather than my intellect. Going straight to the source is often always the easiest.
– Benjamin Gruenbaum
Jun 28 '13 at 22:08
...
What is the fastest way to get the value of π?
...nd three had 15, of course this is with doubles, so it might have an error based on its representation and the true calculation could be more accurate.
let pi_2 iters =
let rec loop_ a b t p i =
if i = 0 then a,b,t,p
else
let a_n = (a +. b) /. 2.0
and b_...
Python dict how to create key or append an element to key?
...e absent key lookups will insert an empty list-- i think you should choose based on which behaviour you want
– Chris_Rands
Oct 30 '19 at 14:10
...
How to override and extend basic Django admin templates?
...o.template.backends.django.DjangoTemplates',
'DIRS': [os.path.join(BASE_DIR, 'templates')], # <- add this line
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.co...
Signal handling with multiple threads in Linux
...
This is slightly nuanced, based on which version of the Linux kernel you are using.
Assuming 2.6 posix threads, and if you are talking about the OS sending SIGTERM or SIGHUP, the signal is sent to process, which is received by and handled by root thr...
How can I install from a git subdirectory with pip?
...
For branch-based install use: pip install git+ssh://git@github.com/org_or_username/repo.git@branch#subdirectory=path/to/dubdir
– RDK
Sep 6 '19 at 6:41
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