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Ruby on Rails: How do you add add zeros in front of a number if it's under 10?
...e '%02d' means to print an integer (d) taking up at least 2 characters (2) and left-padding with zeros instead of spaces (0).
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XPath to find elements that does not have an id or class
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Pretty straightforward:
//tr[not(@id) and not(@class)]
That will give you all tr elements lacking both id and class attributes. If you want all tr elements lacking one of the two, use or instead of and:
//tr[not(@id) or not(@class)]
When attributes and eleme...
WCF Error - Could not find default endpoint element that references contract 'UserService.UserServic
...with the same problem. My application was also a Silverlight application and the service was being called from a class library with a custom UserControl that was being used in it.
The solution is simple. Copy the endpoint definitions from the config file (e.g. ServiceReferences.ClientConfig) of ...
Swift: Convert enum value to String?
... example above, CompassPoint.south has an implicit raw value of
"south", and so on.
You access the raw value of an enumeration case with its rawValue
property:
let sunsetDirection = CompassPoint.west.rawValue
// sunsetDirection is "west"
Source.
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Retrieve the maximum length of a VARCHAR column in SQL Server
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Use the built-in functions for length and max on the description column:
SELECT MAX(LEN(DESC)) FROM table_name;
Note that if your table is very large, there can be performance issues.
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Does Git warn me if a shorthand commit ID can refer to 2 different commits?
...g tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
I just tested this on a real Git repository, by finding commits with duplicate prefixes like this:
git rev-list master | cut -c-4 | sort | uniq -c | sort -nr | head
Thi...
How exactly does tail recursion work?
I almost understand how tail recursion works and the difference between it and a normal recursion. I only don't understand why it doesn't require stack to remember its return address.
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Escaping keyword-like column names in Postgres
... named "select", whereas an unquoted select would be
taken as a key word and would therefore provoke a parse error when
used where a table or column name is expected.
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Get last result in interactive Python shell
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Just for the record, ipython takes this one step further and you can access every result with _ and its numeric value
In [1]: 10
Out[1]: 10
In [2]: 32
Out[2]: 32
In [3]: _
Out[3]: 32
In [4]: _1
Out[4]: 10
In [5]: _2
Out[5]: 32
In [6]: _1 + _2
Out[6]: 42
In [7]: _6
Out[7]: 42...
What is the idiomatic way to compose a URL or URI in Java?
... .setParameters(qparams); as @stian said
– vanduc1102
Mar 27 '15 at 9:32
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