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What is a elegant way in Ruby to tell if a variable is a Hash or an Array?
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This won't work if your code is dependent on the ordering of the data(e.g. if you are using each_with_index). The order of the elements is implemented differently between hashes and arrays and it is different between ruby versions.(intertwingly.net/slides/2008/oscon/ruby19/...
Restoring state of TextView after screen rotation?
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In order to retain data on orientation change you need to implement the two methods:
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
// Read...
ADB Shell Input Events
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3 --> "KEYCODE_HOME"
4 --> "KEYCODE_BACK"
5 --> "KEYCODE_CALL"
6 --> "KEYCODE_ENDCALL"
7 --> "KEYCODE_0"
8 --> "KEYCODE_1"
9 --> "KEYCODE_2"
10 --> "KEYCODE_3"
11 --> "KEYCODE_4"
12 --> "KEYCODE_5"
13 --> "KEYCODE_6"
14 --> "KEYCODE_7"
1...
How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
...ssing token (see below), is
replaced by the corresponding argument after all macros contained therein have been
expanded. Before being substituted, each argument’s preprocessing tokens are
completely macro replaced as if they formed the rest of the preprocessing file; no other
preprocessin...
Equivalent of varchar(max) in MySQL?
...icrosoft SQL server versions prior to version 2005 was limited to 8KB. In order to store more than 8KB you would have to use TEXT, NTEXT, or BLOB columns types, these column types stored their data as a collection of 8K pages separate from the table data pages; they supported storing up to 2GB per ...
Python argparse mutual exclusive group
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add_mutually_exclusive_group doesn't make an entire group mutually exclusive. It makes options within the group mutually exclusive.
What you're looking for is subcommands. Instead of prog [ -a xxxx | [-b yyy -c zzz]], you'd have:
p...
How to fix the Hibernate “object references an unsaved transient instance - save the transient insta
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@xtian: Well then you have to take care of the right order of saving to the database by persisting the objects with an EntityManager. In basic you just say em.persist(object1); em.persist(object2); etc.
– kaba713
Jan 24 '18 at 15:20
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python: Change the scripts working directory to the script's own directory
... __file__ fails in "frozen" programs (created using py2exe, PyInstaller, cx_Freeze). sys.argv[0] works. @ChrisDown: If you want to follow symlinks; os.path.realpath() could be used.
– jfs
Apr 5 '14 at 20:12
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Insertion Sort vs. Selection Sort
...ed element.
So, in a selection sort, sorted elements are found in output order, and stay put once they are found. Conversely, in an insertion sort, the unsorted elements stay put until consumed in input order, while elements of the sorted region keep getting moved around.
As far as swapping is c...
How can I order a List?
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ListaServizi = ListaServizi.OrderBy(q => q).ToList();
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