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What's the safest way to iterate through the keys of a Perl hash?
...);
keys %h;
while(my($k, $v) = each %h)
{
$h{uc $k} = $h{$k} * 2; # BAD IDEA!
}
produces incorrect results in hard-to-predict ways. For example:
(a => 1, A => 2, b => 2, B => 8)
This, however, is safe:
keys %h;
while(my($k, $v) = each %h)
{
if(...)
{
delete $h{$k}; # Th...
Generating a random password in php
...
Generating password using rand is a really bad idea. It's not a secure PRNG. (and no mt_rand isn't better either)
– CodesInChaos
Oct 31 '13 at 16:56
19
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Can you “ignore” a file in Perforce?
... Discussion 'Make the ignore feature work out the box' at p4ideax.com/ideas/17856/…
– Colonel Panic
May 24 '13 at 10:34
...
What is the HMVC pattern?
...is in Kohana's docs and the one on wikipedia didn't really give me a clear idea.
5 Answers
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LINQ equivalent of foreach for IEnumerable
...h considering why this isn't in the framework to start with. I believe the idea is that the LINQ query operators should be side-effect-free, fitting in with a reasonably functional way of looking at the world. Clearly ForEach is exactly the opposite - a purely side-effect-based construct.
That's no...
Check if an image is loaded (no errors) with jQuery
...omplete and naturalWidth properties, in that order.
https://stereochro.me/ideas/detecting-broken-images-js
function IsImageOk(img) {
// During the onload event, IE correctly identifies any images that
// weren’t downloaded as not complete. Others should too. Gecko-based
// browsers a...
iOS: Access app-info.plist variables in code
... version number now has two attributes in the info.plist - but you get the idea? If you view your info.plist as source code (right click the info.plist - select Open As) then you will get to see all the various key names you can use.
...
Update data in ListFragment as part of ViewPager
...ateDisplay(); // do what updates are required
}
}
I've no idea if this is a valid way of doing it, but it'll do until something better is suggested.
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Detect if homebrew package is installed
...lse
# The package is not installed
fi
That said, it is probably a good idea to check for the existence of the tool at all and not just checking for the respective homebrew package (e.g. by searching for the executable in the $PATH). People tend to install tools in a rather large amount of ways i...
Django Rest Framework: Dynamically return subset of fields
...I had a look at that implementation, and it looks like it's the same basic idea. But the dbrgn implementation has some differences: 1. doesn't support exclude with fields!=key1,key2. 2. also modifies serializers outside of GET request context, which can and will break some PUT/POST requests. 3. d...