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What is a good Hash Function?
...umb is not to roll your own. Try to use something that has been thoroughly tested, e.g., SHA-1 or something along those lines.
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Which would be better for concurrent tasks on node.js? Fibers? Web-workers? or Threads?
...p to date info on the status of Web workers in io.js/Node.js.
Update 3
Latest info - thanks to NiCk Newman for posting it in
the comments: There is the workers: initial implementation commit by Petka Antonov from Sep 6, 2015
that can be downloaded and tried out in
this tree. See comments by NiCk ...
Why use String.Format? [duplicate]
...er is not faster than concatenation. The myth that it is is supported by "tests" that actually do concatenation on different lines (or in a loop). When all concatenation is done on a single line, the compiler translates it into a string.append(paramaarray) call, which is the most efficient out of ...
Fastest way to count exact number of rows in a very large table?
...T(*) FROM MyBigtable WITH (NOLOCK)
-- NOLOCK here is for me only to let me test for this answer: no more, no less
1 runs, 5:46 minutes, count = 1,401,659,700
--Note, sp_spaceused uses this DMV
SELECT
Total_Rows= SUM(st.row_count)
FROM
sys.dm_db_partition_stats st
WHERE
object_name(objec...
Generating CSV file for Excel, how to have a newline inside a value
...ll be trashed.
Following comments apply to Excel 2003, 2007 and 2013; not tested on Excel 2000
If you open the file by double-clicking on its name in Windows Explorer, everything works OK.
If you open it from within Excel, the results vary:
You have only ASCII characters in the file (and no BOM...
JPQL IN clause: Java-Arrays (or Lists, Sets…)?
...getResultList();
assertNotNull(actual);
assertEquals(2, actual.size());
Tested with EclipseLInk. With Hibernate 3.5.1, you'll need to surround the parameter with parenthesis:
String qlString = "select item from Item item where item.name IN (:names)";
But this is a bug, the JPQL query in the pr...
Do you use source control for your database items? [closed]
...proach tends make it faster to create/replace/update a database with the latest migrations, whereas a state-based approach makes actually creating changes. Which approach is better depends partly on whether you prioritize frequent database changes (use state-based) or frequent deployments to produc...
moving committed (but not pushed) changes to a new branch after pull
...anch, perform these steps:
git log
git diff {previous to last commit} {latest commit} > your_changes.patch
git reset --hard origin/{your current branch}
git checkout -b {new branch}
git apply your_changes.patch
I can imagine that there is a simpler approach for steps one and two.
...
Replace one character with another in Bash
...acters. It seems like bash's time complexity is worse than linear. A small test: x="$(tr -dc 'a-z \n' </dev/urandom | head -c1M)"; time y="$(tr ' ' \\- <<< "$x")"; time z="${x// /-}". With a string length of 1M (=2^20) tr took 0.04s and bash 5.0.11 took 17s. With 2M tr took 0.07s (expec...
Force CloudFront distribution/file update
... Invalidation request there: docs.amazonwebservices.com/AmazonCloudFront/latest/…
– j0nes
Jul 26 '12 at 6:50
For tho...