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What is the meaning of single and double underscore before an object name?
...at least two leading underscores, at most one trailing underscore) is textually replaced with _classname__spam, where classname is the current class name with leading underscore(s) stripped. This mangling is done without regard to the syntactic position of the identifier, so it can be used to define...
Can I add a custom attribute to an HTML tag?
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There is a good table of different doctypes and corresponding browser modes here: hsivonen.fi/doctype/#handling. HTML5 doctype switches all post-2001 browsers into (Full) Standards mode. XHTML Transitional and HTML 4 Transitional (especially...
How to make a valid Windows filename from an arbitrary string?
...: Bar" that I want to use as a filename, but on Windows the ":" char isn't allowed in a filename.
14 Answers
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How to sort an IEnumerable
How can I sort an IEnumerable<string> alphabetically. Is this possible?
4 Answers
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How can I quickly sum all numbers in a file?
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For a Perl one-liner, it's basically the same thing as the awk solution in Ayman Hourieh's answer:
% perl -nle '$sum += $_ } END { print $sum'
If you're curious what Perl one-liners do, you can deparse them:
% perl -MO=Deparse -nle '$sum += $_ } END ...
Which Java Collection should I use?
...resenting a Collection with no duplicates.
HashSet: A Set backed by a Hashtable. Fastest and smallest memory usage, when ordering is unimportant.
LinkedHashSet: A HashSet with the addition of a linked list to associate elements in insertion order. The "next" element is the next-most-recently insert...
nullable object must have a value
...checking for null in your lambda.
Example:
MyEnum? type = null;
Entities.Table.Where(a => type == null ||
a.type == (int)type).ToArray(); // Exception: Nullable object must have a value
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Hashset vs Treeset
...some sense intermediate between HashSet and TreeSet. Implemented as a hash table with a linked list running through it, however,it provides insertion-ordered iteration which is not same as sorted traversal guaranteed by TreeSet.
So a choice of usage depends entirely on your needs but I feel that e...
How can I selectively escape percent (%) in Python strings?
...ng character.
In the documentation of Python, at the bottem of the second table in that section, it states:
'%' No argument is converted, results in a '%' character in the result.
Therefore you should use:
selectiveEscape = "Print percent %% in sentence and not %s" % (test, )
(please n...
AI2 Keep Awake
...eping your Android application running when the device wants to sleep . Table of contents Download Test results WakeLock WifiLock Battery optimization Foreground service Usage Request WakeLock Multiple WakeLocks Notification / Notification Channels NotificationChannel Notification N...