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Calculate MD5 checksum for a file
... @Quibblesome, I was just trying to promote the general idea that the order of nesting of using statements matters. Elsewhere, the difference might be significant. Why not practice the habit of detecting failure early? I agree, though, that in this specific snippet, the habit brings almost no b...
Double Iteration in List Comprehension
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Order of iterators may seem counter-intuitive.
Take for example: [str(x) for i in range(3) for x in foo(i)]
Let's decompose it:
def foo(i):
return i, i + 0.5
[str(x)
for i in range(3)
for x in foo(i)
]
# ...
How to check if a symlink exists
...
do you really see a difference between -L and -h ? in my bash ( version 4.2.53(1)-release (x86_64-redhat-linux-gnu ) man bash is identical for both -L and -h and they behave the same, ie they check that file actualy is a link and don'...
.append(), prepend(), .after() and .before()
...ng jQuery
</div>
So although these functions flip the parameter order, each creates the same element nesting:
var $div = $('<div>').append($('<img>'));
var $img = $('<img>').appendTo($('<div>'))
...but they return a different element. This matters for method cha...
iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate]
...mes will require more efforts).
I've created a small UIDevice category in order to deal with all screen resolutions. You can get it here, but the code is as follows:
File UIDevice+Resolutions.h:
enum {
UIDeviceResolution_Unknown = 0,
UIDeviceResolution_iPhoneStandard = 1, ...
Random strings in Python
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In many cases, random isn't really required. Rather, all you really need is unique.
– Chase Seibert
Jan 8 '10 at 19:48
1
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Rails: How to get the model class name based on the controller class name?
...ntroller
def index
# Equivalent of @house_buyers = HouseBuyer.find(:all)
objects = controller_name.classify.constantize.find(:all)
instance_variable_set("@#{controller_name}", objects)
end
end
share
...
Check whether a string is not null and not empty
...amp;& !str.isEmpty())
Be sure to use the parts of && in this order, because java will not proceed to evaluate the second part if the first part of && fails, thus ensuring you will not get a null pointer exception from str.isEmpty() if str is null.
Beware, it's only available s...
MAC addresses in JavaScript
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I concur with all the previous answers that it would be a privacy/security vulnerability if you would be able to do this directly from Javascript. There are two things I can think of:
Using Java (with a signed applet)
Using signed Javasc...
Should I Dispose() DataSet and DataTable?
... both implement IDisposable, so, by conventional best practices, I should call their Dispose() methods.
10 Answers
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