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What is the best way to test for an empty string with jquery-out-of-the-box?
... Since that is the usual-case, OP should include in his answer the comment from @IlariKajaste
– Bane
Aug 19 '13 at 17:25
18
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Easiest way to check for an index or a key in an array?
... tests only for existence [of parameter]
This answer is actually adapted from the answers for this SO question: How to tell if a string is not defined in a bash shell script?
A wrapper function:
exists(){
if [ "$2" != in ]; then
echo "Incorrect usage."
echo "Correct usage: exists {k...
How to count the number of set bits in a 32-bit integer?
...he expense of a 'cache miss', where the CPU has to fetch some of the table from main memory. (Look up each byte separately to keep the table small.)
If you know that your bytes will be mostly 0's or mostly 1's then there are very efficient algorithms for these scenarios.
I believe a very good gener...
Check OS version in Swift?
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I made helper functions that were transferred from the below link into swift:
How can we programmatically detect which iOS version is device running on?
func SYSTEM_VERSION_EQUAL_TO(version: String) -> Bool {
return UIDevice.currentDevice().systemVersion.compare...
Undefined reference to vtable
...rtual destructor (was switching to unique / shared pointers and removed it from the source file, but didn't have an "implementation" in the header)
– svenevs
Apr 30 '16 at 7:57
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Covariance and contravariance real world example
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Let's say you have a class Person and a class that derives from it, Teacher. You have some operations that take an IEnumerable<Person> as the argument. In your School class you have a method that returns an IEnumerable<Teacher>. Covariance allows you to directly use th...
Error: “Cannot modify the return value” c#
...arefully perhaps you actually mean to modify the backing variable directly from within your class:-
myOrigin.X = 10;
Yes that would be what you would need.
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What is the difference between AF_INET and PF_INET in socket programming?
...l source code that PF_INET and AF_INET are the same.
The following code is from file include/linux/socket.h, line 204 of Linux kernel 3.2.21 tree.
/* Protocol families, same as address families. */
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#define PF_INET AF_INET
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In Visual Studio C++, what are the memory allocation representations?
...ADF00D 0x00000031 0xDDDDDDDD 0xFEEEFEEE Request #, increases from 0
0x00320FFC -4 0xBAADF00D 0xFDFDFDFD 0xDDDDDDDD 0xFEEEFEEE No mans land
0x00321000 +0 0xBAADF00D 0xCDCDCDCD 0xDDDDDDDD 0xFEEEFEEE The 8 bytes you wanted
0x00321004 +4 0xBAADF00...
Styling HTML email for Gmail
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@ArianHosseinzadeh I did a copy-n-paste from their example in their docs, and ran it through putsmail. Styles are showing in gmail. I verified Android gmail app and gmail in a Chrome browser. My guess is that the Litmus previews haven't been updated to reflect t...