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Blocks and yields in Ruby
...itrary segments of code.
When a method expects a block, it invokes it by calling the yield function.
This is very handy, for instance, to iterate over a list or to provide a custom algorithm.
Take the following example:
I'm going to define a Person class initialized with a name, and provide a...
Detect if the app was launched/opened from a push notification
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I am getting the call to application:didReceiveRemoteNotification: after tapping the notification regardless of whether the app is just in the background or not running at all so this answer suits my needs perfectly. Tested on iOS 7 & 8
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What's an object file in C?
...s symbols it requires in order to work. (For reference, "symbols" are basically names of global objects, functions, etc.)
A linker takes all these object files and combines them to form one executable (assuming that it can, ie: that there aren't any duplicate or undefined symbols). A lot of compi...
php: determine where function was called from
is there a way to find out, where a function in PHP was called from?
example:
8 Answers
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How to kill zombie process
...nate the zombie. (After the parent dies, the zombie will be inherited by pid 1, which will wait on it and clear its entry in the process table.) If your daemon is spawning children that become zombies, you have a bug. Your daemon should notice when its children die and wait on them to determine t...
SQL selecting rows by most recent date
...g query and results, I'm looking for the most recent entry where the ChargeId and ChargeType are unique.
5 Answers
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Difference between staticmethod and classmethod
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Maybe a bit of example code will help: Notice the difference in the call signatures of foo, class_foo and static_foo:
class A(object):
def foo(self, x):
print "executing foo(%s, %s)" % (self, x)
@classmethod
def class_foo(cls, x):
print "executing class_foo(%s, %...
Call An Asynchronous Javascript Function Synchronously
...ific case of doing it the wrong way on-purpose to retrofit an asynchronous call into a very synchronous codebase that is many thousands of lines long and time doesn't currently afford the ability to make the changes to "do it right." It hurts every fiber of my being, but reality and ideals often do ...
Expand a random range from 1–5 to 1–7
... for some readers. It assumes rand5() is a function that returns a statistically random integer in the range 1 through 5 inclusive.
int rand7()
{
int vals[5][5] = {
{ 1, 2, 3, 4, 5 },
{ 6, 7, 1, 2, 3 },
{ 4, 5, 6, 7, 1 },
{ 2, 3, 4, 5, 6 },
{ 7, 0, 0, 0, ...
String to Dictionary in Python
...thentication to register users on my site, and I'm trying to do it server side. I've gotten to the point where I get my access token, and when I go to:
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