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How to set environment variables in Jenkins?
...red May 16 '12 at 20:28
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Is null reference possible?
...act of dereferencing, here's the link: open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1102
– Johannes Schaub - litb
Dec 6 '10 at 9:03
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Fix warning “Capturing [an object] strongly in this block is likely to lead to a retain cycle” in AR
...r using it inside the block should be ok, but it still shows the warning.
__block ASIHTTPRequest *request = [[ASIHTTPRequest alloc] initWithURL:...
[request setCompletionBlock:^{
NSDictionary *jsonDictionary = [[CJSONDeserializer deserializer] deserialize:request.responseData error:nil];
r...
Is there an alternative sleep function in C to milliseconds?
...s defined usleep(), so this is available on Linux:
int usleep(useconds_t usec);
DESCRIPTION
The usleep() function suspends execution of the calling thread for
(at least) usec microseconds. The sleep may be lengthened slightly by
any system activity or by the tim...
Simplest two-way encryption using PHP
...
Edited:
You should really be using openssl_encrypt() & openssl_decrypt()
As Scott says, Mcrypt is not a good idea as it has not been updated since 2007.
There is even an RFC to remove Mcrypt from PHP - https://wiki.php.net/rfc/mcrypt-viking-funeral
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Verifying that a string contains only letters in C#
...
Only letters, numbers and underscore:
Regex.IsMatch(input, @"^[a-zA-Z0-9_]+$");
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What is the Java string pool and how is “s” different from new String(“s”)? [duplicate]
... a reference to an instance of class String, and is derived from a CONSTANT_String_info structure (§4.4.3) in the binary representation of a class or interface. The CONSTANT_String_info structure gives the sequence of Unicode code points constituting the string literal.
The Java programming la...
Ways to implement data versioning in MongoDB
...nt contain a dictionary of time-stamped diffs. Something like this:
{
_id : "id of address book record",
changes : {
1234567 : { "city" : "Omaha", "state" : "Nebraska" },
1234568 : { "city" : "Kansas City", "state" : "Missouri" }
}
}
To make...
How to replace NaN values by Zeroes in a column of a Pandas Dataframe?
...ange any values (as of pandas 0.15):
idx = pd.IndexSlice
df.loc[idx[:,mask_1],idx[mask_2,:]].fillna(value=0,inplace=True)
The "problem" is that the chaining breaks the fillna ability to update the original dataframe. I put "problem" in quotes because there are good reasons for the design decision...
Getting the class name from a static method in Java
...ass<?>> myself = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE) .walk(s -> s.map(StackWalker.StackFrame::getDeclaringClass) .findFirst());, but of course, that’s connected to the fact that it will be much more powerful.
– Holger
...