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How can I switch my git repository to a particular commit
...anch (locally):
With the commit hash (or part of it)
git checkout -b new_branch 6e559cb
or to go back 4 commits from HEAD
git checkout -b new_branch HEAD~4
Once your new branch is created (locally), you might want to replicate this change on a remote of the same name: How can I push my chang...
Is there a performance gain in using single quotes vs double quotes in ruby?
...
$ 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 = 'a string'; end}
x.report("assi...
rmagick gem install “Can't find Magick-config”
... PATH variable with additional path to ImageMagick lib.
PATH="/usr/lib/x86_64-linux-gnu/ImageMagick-6.8.9/bin-Q16:$PATH"
then run gem install rmagick
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How do I implement an Objective-C singleton that is compatible with ARC?
...redInstance
{
static MyClass *sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance = [[MyClass alloc] init];
// Do any other initialisation stuff here
});
return sharedInstance;
}
...
Set a default parameter value for a JavaScript function
...S2015, default parameters are in the language specification.
function read_file(file, delete_after = false) {
// Code
}
just works.
Reference: Default Parameters - MDN
Default function parameters allow formal parameters to be initialized with default values if no value or undefined is pass...
How do I rename a column in a database table using SQL?
... This is also not supported in Microsoft SQL Server. Instead use sp_rename as per Galwegian's answer: stackoverflow.com/a/174586/834431
– Chris
Dec 11 '13 at 13:15
...
Allow user to select camera or gallery for image
... final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
final PackageManager packageManager = getPackageManager();
final List<ResolveInfo> listCam = packageManager.queryIntentActivities(captureIntent, 0);
for(ResolveInfo res : listCam) {
...
Why should the copy constructor accept its parameter by reference in C++?
...dited Jun 21 '12 at 8:10
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answered Apr 21 '10 at 19:14
...
How to configure PostgreSQL to accept all incoming connections
...s regardless of the source IP address. How can this be configured in the pg_hba.conf file? I'm using postgreSQL version 8.4.
...
Skip Git commit hooks
...k folder elsewhere, and setup a post-merge hook (git-scm.com/docs/githooks#_post_merge) which will detect if the pull affect the repo hook folder, and will propose to copy its content to your local hook folder (outside of the repo): that way, you can at least control if you want your hooks overridde...