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Find size of an array in Perl
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The size of (1,2,3) is 3, and the indexes are (by default) 0, 1 and 2. So, $#arr will be 2 in this case, not 3.
– Nate C-K
Sep 13 '11 at 18:47
5
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How can I lock a file using java (if possible)
... the lock of for the JVM, and not suitable for locking the file for access by individual threads within a single JVM.
– Stu Thompson
Sep 25 '08 at 7:00
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Adding n hours to a date in Java?
...a.util.Calendar, and java.text.SimpleDateFormat are now legacy, supplanted by the java.time classes built into Java 8 & Java 9. See Tutorial by Oracle.
– Basil Bourque
Mar 25 '18 at 18:48
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Slowing speed of Viewpager controller in android
...rtant method (smoothScrollTo) can't be overridden.
I ended up fixing this by extending Scroller with this code:
public class FixedSpeedScroller extends Scroller {
private int mDuration = 5000;
public FixedSpeedScroller(Context context) {
super(context);
}
public FixedSpe...
Grep not as a regular expression
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Escape the $ by putting a \ in front of it.
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Permission denied on accessing host directory in Docker
...Is there any official documentation about this?
– Kirby
Oct 16 '16 at 12:51
1
Upstream has it as ...
Why use Abstract Base Classes in Python?
...rs.
In a staticly-typed language, that contract would actually be enforced by the compiler. In Python, you can use EAFP or type introspection to confirm that the unknown object meets this expected contract.
But there are also higher-level, semantic promises in the contract.
For example, if there is ...
shell init issue when click tab, what's wrong with getcwd?
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@kevinarpe, yes, $PWD is guaranteed by POSIX to be defined. See pubs.opengroup.org/onlinepubs/9699919799/utilities/…
– Charles Duffy
Sep 3 '15 at 16:38
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Python argparse command line flags without arguments
...lue after -w on the command line. If you are just looking to flip a switch by setting a variable True or False, have a look at http://docs.python.org/dev/library/argparse.html#action (specifically store_true and store_false)
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('-...
Covariance, Invariance and Contravariance explained in plain English?
...bove.
At heart, these terms describe how the subtype relation is affected by type transformations. That is, if A and B are types, f is a type transformation, and ≤ the subtype relation (i.e. A ≤ B means that A is a subtype of B), we have
f is covariant if A ≤ B implies that f(A) ≤ f(B)
f ...