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Generate array of all letters and digits
...ng under Ruby 2.1 [*('a'..'z'),*('0'..'9')] is a little more than twice as fast as (0...36).map{|i|i.to_s 36} (1.450000s versus 2.26000s where n = 100,000). If inclusion of upcase is desired, use the following: [*('a'..'z'),*('A'..'Z'),*('0'..'9')]
– Viet
Feb 2...
Postgresql - change the size of a varchar column to lower length
...R COLUMN "mycolumn" TYPE varchar(40);
COMMIT;
this worked for me blazing fast, few seconds on a table with more than 4
How to create a HashMap with two keys (Key-Pair, Value)?
...e this:
public int hashCode() {
return (X << 16) + Y;
}
This is fast and returns unique hashes for keys between -2^16 and 2^16-1 (-65536 to 65535). This fits in almost any case. Very rarely you are out of this bounds.
Third, when implementing equals() also know what it is used for and be...
What is the purpose of XORing a register with itself? [duplicate]
...
Actually, in the big picture it's faster. There are fewer bytes that have to be fetched from RAM.
– Loren Pechtel
Dec 7 '09 at 0:21
12
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Append value to empty vector in R?
... should pre-allocate the entire vector before the loop. This will be much faster than appending for larger vectors.
set.seed(21)
values <- sample(letters, 1e4, TRUE)
vector <- character(0)
# slow
system.time( for (i in 1:length(values)) vector[i] <- values[i] )
# user system elapsed
#...
Best way to iterate through a Perl array
...a benchmark to confirm, but I suspect you'll find #1 and #4 to be slightly faster because the iteration work is done in C instead of Perl, and no needless copying of the array elements occurs. ($_ is aliased to the element in #1, but #2 and #3 actually copy the scalars from the array.)
#5 might be ...
Why is “origin/HEAD” shown when running “git branch -r”?
...master
Local ref configured for 'git push':
master pushes to master (fast-forwardable)
Note the line that says "HEAD branch: master". This is where the remote repository lets clients know which branch to checkout by default.
...
How to convert an integer to a string in any base?
... ancient versions of Python, you can either use gmpy (which does include a fast, completely general int-to-string conversion function, and can be built for such ancient versions -- you may need to try older releases since the recent ones have not been tested for venerable Python and GMP releases, on...
How to identify server IP address in PHP
...shouldn't. The local hostname should be in the /etc/hosts file and will be fast - although it might just be 127.0.0.1. If it does have to call DNS then it will be slow like you say.
– Ariel
Feb 12 '15 at 10:39
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Base64 encoding and decoding in client-side Javascript
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Short and fast Base64 JavaScript Decode Function without Failsafe:
function decode_base64 (s)
{
var e = {}, i, k, v = [], r = '', w = String.fromCharCode;
var n = [[65, 91], [97, 123], [48, 58], [43, 44], [47, 48]];
for (...