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Is there a way to iterate over a slice in reverse in Go?
...
No there is no convenient operator for this to add to the range one in place. You'll have to do a normal for loop counting down:
s := []int{5, 4, 3, 2, 1}
for i := len(s)-1; i >= 0; i-- {
fmt.Println(s[i])
}
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What does new self(); mean in PHP?
... the class that is used (we used MyChildClass::getInstance()), and not the one in which it is written.
Of course, the behavior of self has not been changed, to not break existing applications -- PHP 5.3 just added a new behavior, recycling the static keyword.
And, speaking about PHP 5.3, you migh...
HTML5 Canvas vs. SVG vs. div
...ces mean that some of the footwork of dealing with the things you draw is done for you. And SVG is faster when rendering really large objects, but slower when rendering many objects.
A game would probably be faster in Canvas. A huge map program would probably be faster in SVG. If you do want to use...
Python: fastest way to create a list of n lists
... in xrange(n)]
is
from itertools import repeat
d = [[] for i in repeat(None, n)]
It does not have to create a new int object in every iteration and is about 15 % faster on my machine.
Edit: Using NumPy, you can avoid the Python loop using
d = numpy.empty((n, 0)).tolist()
but this is actuall...
Is there a command line utility for rendering GitHub flavored Markdown?
...w: Read from stdin and export to stdout added in 3.0
Hope this helps someone here. Check it out.
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What is the alternative for ~ (user's home directory) on Windows command prompt?
...%systemdrive% environment variable which is equivalent of %homedrive% mentioned by Alex. Please do give me your feedback on this if you find anything incorrect.
– RBT
Jul 23 '17 at 4:26
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What causes and what are the differences between NoClassDefFoundError and ClassNotFoundException?
... trying to call is does not exist.
The difference between the two is that one is an Error and the other is an Exception. With NoClassDefFoundError is an Error and it arises from the Java Virtual Machine having problems finding a class it expected to find. A program that was expected to work at comp...
Argparse: Required arguments listed under “optional arguments”?
I use the following simple code to parse some arguments; note that one of them is required. Unfortunately, when the user runs the script without providing the argument, the displayed usage/help text does not indicate that there is a non-optional argument, which I find very confusing. How can I get p...
What exactly does an #if 0 … #endif block do?
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It's identical to commenting out the block, except with one important difference: Nesting is not a problem. Consider this code:
foo();
bar(x, y); /* x must not be NULL */
baz();
If I want to comment it out, I might try:
/*
foo();
bar(x, y); /* x must not be NULL */
baz();
*/
...
Command not found when using sudo
...WRITE and EXECUTE permissions for the file owner, the group owner and everyone else who is not the file owner or a member of the group to which the file belongs (that last permission group is sometimes referred to as "world" or "other")
Here's a summary of how to troubleshoot the Permission Denied ...