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What is the “right” way to iterate through an array in Ruby?
...HP, for all its warts, is pretty good on this count. There's no difference between an array and a hash (maybe I'm naive, but this seems obviously right to me), and to iterate through either you just do
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Check for column name in a SqlDataReader object
How do I check to see if a column exists in a SqlDataReader object? In my data access layer, I have create a method that builds the same object for multiple stored procedures calls. One of the stored procedures has an additional column that is not used by the other stored procedures. I want to ...
Google Maps API 3 - Custom marker color for default (dot) marker
... seen lots of other questions similar to this ( here , here and here ), but they all have accepted answers that don't solve my problem. The best solution I have found to the problem is the StyledMarker library, which does let you define custom colours for markers, but I can't get it to use the ...
Converting Go struct to JSON
I am trying to convert a Go struct to JSON using the json package but all I get is {} . I am certain it is something totally obvious but I don't see it.
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What's the difference between parenthesis $() and curly bracket ${} syntax in Makefile?
Is there any differences in invoking variables with syntax ${var} and $(var) ? For instance, in the way the variable will be expanded or anything?
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Annotating text on individual facet in ggplot2
...you'd do something like this:
ann_text <- data.frame(mpg = 15,wt = 5,lab = "Text",
cyl = factor(8,levels = c("4","6","8")))
p + geom_text(data = ann_text,label = "Text")
It should work without specifying the factor variable completely, but will probably throw some warnin...
Ternary Operator Similar To ?:
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We can combine How to define a ternary operator in Scala which preserves leading tokens? with the answer to Is Option wrapping a value a good pattern? to get
scala> "Hi".getClass.getSimpleName |> {x => x.endsWith("$") ? x.i...
pass **kwargs argument to another function with **kwargs
...example you provide 3 arguments: filename, mode and a dictionary (kwargs). But Python expects: 2 formal arguments plus keyword arguments.
By prefixing the dictionary by '**' you unpack the dictionary kwargs to keywords arguments.
A dictionary (type dict) is a single variable containing key-value p...
Is there a TRY CATCH command in Bash
I'm writing a shell script and need to check that a terminal app has been installed. I want to use a TRY/CATCH command to do this unless there is a neater way.
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Android read text raw resource file
Things are simple but don't work as supposed to.
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