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Odd behavior when Java converts int to byte?
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In Java, an int is 32 bits. A byte is 8 bits .
Most primitive types in Java are signed, and byte, short, int, and long are encoded in two's complement. (The char type is unsigned, and the concept of a sign is not applicable to boolean.)
In this number scheme t...
No secret option provided to Rack::Session::Cookie warning?
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86
This is a Rails bug, as the subclass is violating the superclass API contract.
The warn...
How to concatenate strings of a string field in a PostgreSQL 'group by' query?
...SELECT string_agg(actor_name, ', ' ORDER BY first_appearance)
PostgreSQL 8.4 or later:
PostgreSQL 8.4 (in 2009) introduced the aggregate function array_agg(expression) which concatenates the values into an array. Then array_to_string() can be used to give the desired result:
SELECT company_id, a...
mysql_config not found when installing mysqldb python interface
...eference:
https://github.com/JudgeGirl/Judge-sender/issues/4#issuecomment-186542797
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How do I get the key at a specific index from a Dictionary in Swift?
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Iulian Onofrei
6,77988 gold badges5252 silver badges9393 bronze badges
answered Jul 8 '14 at 20:20
Mick MacCallumMick Mac...
How to filter out files by extension in NERDTree?
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edited Apr 8 '11 at 23:45
answered Apr 8 '11 at 23:40
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What is the 'cls' variable used for in Python classes?
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The distinction between "self" and "cls" is defined in PEP 8 . As Adrien said, this is not a mandatory. It's a coding style. PEP 8 says:
Function and method arguments:
Always use self for the first argument to instance methods.
Always use cls for the first argument to class methods....
Where does Jenkins store configuration files for the jobs it runs?
...onfig file from a Jenkins node by running: curl http://<ip-address>:8080/job/<job-name>/config.xml > jenkins_config.xml
– JESii
Mar 17 '16 at 14:38
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C# Equivalent of SQL Server DataTypes
...SQL Server 2005. There are updated versions of the table for SQL Server 2008, SQL Server 2008 R2, SQL Server 2012 and SQL Server 2014.
SQL Server Data Types and Their .NET Framework Equivalents
The following table lists Microsoft SQL Server data types, their equivalents in the common language runt...
Ruby: How to get the first character of a string
...ial # prints S
The other method mentioned here doesn't work on Ruby 1.8 (not that you should be using 1.8 anymore anyway!--but when this answer was posted it was still quite common):
puts 'Smith'[0] # prints 83
Of course, if you're not doing it on a regular basis, then defining the...