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Why doesn't Ruby support i++ or i-- (increment/decrement operators)?
...leksi Niemelä <aleksi.niemela@cinnober.com> writes:
|I got an idea from http://www.pragprog.com:8080/rubyfaq/rubyfaq-5.html#ss5.3
|and thought to try. I didn't manage to make "auto(in|de)crement" working so
|could somebody help here? Does this contain some errors or is the idea
|wrong?
(1...
What is the difference between instanceof and Class.isAssignableFrom(…)?
..., you need to know the class of B at compile time. When using isAssignableFrom() it can be dynamic and change during runtime.
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Check a collection size with JSTL
...ly using a too old EL version. You'll need JSTL fn:length() function then. From the documentation:
length( java.lang.Object) - Returns the number of items in a collection, or the number of characters in a string.
Put this at the top of JSP page to allow the fn namespace:
<%@ taglib prefix="fn" ...
Using sed and grep/egrep to search and replace
...or this kind of one-liners, especially to "write it back to where it comes from" (perl's -i switch does it for you, and optionally also lets you keep the old version around e.g. with a .bak appended, just use -i.bak instead).
perl -i.bak -pe 's/\.jpg|\.png|\.gif/.jpg/
rather than intricate work i...
How to get a substring of text?
...ast (source code)
'1234567890'.last(2) # => "90"
alternatively check from/to (source code):
"hello".from(1).to(-2) # => "ell"
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What is the easiest/best/most correct way to iterate through the characters of a string in Java?
...ntioned in doc:
Returns a stream of int zero-extending the char values from this
sequence. Any char which maps to a surrogate code point is passed
through uninterpreted. If the sequence is mutated while the stream is
being read, the result is undefined.
The method codePoints() also retur...
How do I get a human-readable file size in bytes abbreviation using .NET?
... @Petoj it does not depend on the OS, the definition is OS-agnostic. From Wikipedia: The unit was established by the International Electrotechnical Commission (IEC) in 1998 and has been accepted for use by all major standards organizations
– ANeves thinks SE is evil
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Why use String.Format? [duplicate]
...p it, since Concat can create an internal buffer of exactly the right size from the start. A SB is used when you have some sort of loop or other control block such that the number of strings being concatted isn't known by the compiler at compile time.
– Servy
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emacs zoom in/zoom out
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It seems that the minus must be from the typewriter keys, not the numeric keypad.
– Viesturs
Apr 2 '18 at 9:57
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What are the lesser known but useful data structures?
...indow has focused.
Amazingly, you can derive them by applying techniques from calculus to the type of the original data structure!
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edited Jul 23 '10 at 3:01
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