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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...
Generate all permutations of a list without adjacent equal elements
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From my understanding, this is what @jojo does - not always optimal.
– georg
Aug 13 '14 at 13:46
10
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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...
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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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 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...
Directory does not exist. Parameter name: directoryVirtualPath
i just published my project to my host on Arvixe and get this error (Works fine local):
20 Answers
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