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Scala @ operator
...ables one to bind a matched pattern to a variable. Consider the following, for instance:
val o: Option[Int] = Some(2)
You can easily extract the content:
o match {
case Some(x) => println(x)
case None =>
}
But what if you wanted not the content of Some, but the option itself? That wo...
Are there any standard exit status codes in Linux?
...#include <signal.h>
int main() {
int status;
pid_t child = fork();
if (child <= 0)
exit(42);
waitpid(child, &status, 0);
if (WIFEXITED(status))
printf("first child exited with %u\n", WEXITSTATUS(status));
/* prints: "first child exited with 42" ...
Java's L number (long) specification
...
There are specific suffixes for long (e.g. 39832L), float (e.g. 2.4f) and double (e.g. -7.832d).
If there is no suffix, and it is an integral type (e.g. 5623), it is assumed to be an int. If it is not an integral type (e.g. 3.14159), it is assumed to b...
How to save an HTML5 Canvas as an image on a server?
...e';
context.stroke();
</script>
Convert canvas image to URL format (base64)
var dataURL = canvas.toDataURL();
Send it to your server via Ajax
$.ajax({
type: "POST",
url: "script.php",
data: {
imgBase64: dataURL
}
}).done(function(o) {
...
Paging UICollectionView by cells, not screen
...
OK, so I found the solution here: targetContentOffsetForProposedContentOffset:withScrollingVelocity without subclassing UICollectionViewFlowLayout
I should have searched for targetContentOffsetForProposedContentOffset in the begining.
...
Python None comparison: should I use “is” or ==?
...r()
print thing == None #True
print thing is None #False
is checks for object identity. There is only 1 object None, so when you do my_var is None, you're checking whether they actually are the same object (not just equivalent objects)
In other words, == is a check for equivalence (which ...
unit testing of private functions with mocha and node.js
I am using mocha in order to unit test an application written for node.js
9 Answers
9
...
Annotating text on individual facet in ggplot2
...n my faceted plot. It's the same problem discussed here (groups.google.com/forum/?fromgroups=#!topic/ggplot2/evsbeBT48M4), and was resolved by using annotate("text",...). Does anyone else get blurry labels with geom_text()?
– Margaret
Feb 6 '13 at 21:54
...
Get fully qualified class name of an object in Python
For logging purposes I want to retrieve the fully qualified class name of a Python object. (With fully qualified I mean the class name including the package and module name.)
...
Block Comments in a Shell Script
...
In bash:
#!/bin/bash
echo before comment
: <<'END'
bla bla
blurfl
END
echo after comment
The ' and ' around the END delimiter are important, otherwise things inside the block like for example $(command) will be parsed and executed.
For an expla...