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How to check if a specific key is present in a hash or not?
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It is very late but preferably symbols should be used as key:
my_hash = {}
my_hash[:my_key] = 'value'
my_hash.has_key?("my_key")
=> false
my_hash.has_key?("my_key".to_sym)
=> true
my_hash2 = {}
my_hash2['my_key'] = 'value'
my_hash2.has_key?("my_key")
=> true
my_hash2.h...
Remove multiple spaces and new lines inside of String
...defined in Rails, so it'll work only in Rails applications, luckily that's my case.
– Kreeki
Aug 18 '11 at 12:05
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Gradle: Execution failed for task ':processDebugManifest'
...ifests have different SDK Versions and cannot be merged.
I needed to edit my Manifests and build.gradle file and everything worked again.
To be clear you need to edit the uses-sdk in the AndroidManifest.xml
<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="16" />
and the a...
How can I access my localhost from my Android device?
I'm able to access my laptop web server using the Android emulator, I'm using 10.0.2.2:portno
works well.
39 Answers
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How to perform a mysqldump without a password prompt?
I would like to know the command to perform a mysqldump of a database without the prompt for the password.
13 Answers
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Any tips on how to organize Eclipse environment on multiple monitors?
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@David My only experience in eclipse comes from CDT and what you are saying is also correct in CDT. Nevertheless if you select a variable in one window, the same variable is highlighted by indexer in the other window. The same appli...
Rails: FATAL - Peer authentication failed for user (PG::Error)
I am running my development on Ubuntu 11.10, and RubyMine
8 Answers
8
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How to save all the variables in the current python session?
I want to save all the variables in my current python environment. It seems one option is to use the 'pickle' module. However, I don't want to do this for 2 reasons:
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How do I perform a Perl substitution on a string while keeping the original?
...s used to get a modified copy of a string without changing the original:
(my $newstring = $oldstring) =~ s/foo/bar/g;
In perl 5.14.0 or later, you can use the new /r non-destructive substitution modifier:
my $newstring = $oldstring =~ s/foo/bar/gr;
Note: The above solutions work without g t...
Can I run multiple programs in a Docker container?
I'm trying to wrap my head around Docker from the point of deploying an application which is intended to run on the users on desktop. My application is simply a flask web application and mongo database. Normally I would install both in a VM and, forward a host port to the guest web app. I'd like to ...