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Is there a performance gain in using single quotes vs double quotes in ruby?
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$ ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.0.0]
$ cat benchmark_quotes.rb
# As of Ruby 1.9 Benchmark must be required
require 'benchmark'
n = 1000000
Benchmark.bm(15) do |x|
x.report("assign single") { n.times do; c...
COUNT DISTINCT with CONDITIONS
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ntalbsntalbs
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How do I do an initial push to a remote repository with Git?
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399
On server:
mkdir my_project.git
cd my_project.git
git --bare init
On client:
mkdir my_proj...
Combining two Series into a DataFrame in pandas
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435
I think concat is a nice way to do this. If they are present it uses the name attributes of the...
Common MySQL fields and their appropriate data types
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da5idda5id
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Javascript reduce on array of objects
...a variable in the next iteration.
Iteration 1: a = {x:1}, b = {x:2}, {x: 3} assigned to a in Iteration 2
Iteration 2: a = {x:3}, b = {x:4}.
The problem with your example is that you're returning a number literal.
function (a, b) {
return a.x + b.x; // returns number literal
}
Iteration 1: ...
How to parse a JSON string to an array using Jackson
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answered Aug 30 '11 at 16:26
mmutilvammutilva
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How to map calculated properties with JPA and Hibernate
...22. Column and formula elements (Hibernate Core documentation)
Section 2.4.3.1. Formula (Hibernate Annotations documentation)
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How to un-commit last un-pushed git commit without losing the changes
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revert commit normally and push
git checkout master
git revert a8172f36 #hash of the commit you want to destroy
# this introduces a new commit (say, it's hash is 86b48ba) which removes changes, introduced in the commit in question (but those changes are still visible in the history)
git push o...
Static link of shared library function in gcc
...://linux.derkeiler.com/Newsgroups/comp.os.linux.development.apps/2004-05/0436.html
You need the static version of the library to link it.
A shared library is actually an executable in a special format
with entry points specified (and some sticky addressing issues
included). It does not have all the ...