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Get last element of Stream/List in a one-liner
...s implementations works for all ordered streams (including streams created from Lists). For unordered streams it is for obvious reasons unspecified which element will be returned.
The implementation works for both sequential and parallel streams. That might be surprising at first glance, and unfort...
ruby system command check exit code
...
From the documentation:
system returns true if the command gives zero exit status, false for
non zero exit status. Returns nil if command execution fails.
system("unknown command") #=> nil
system("echo foo") ...
Declare a block method parameter without using a typedef
...
Another example (this issue benefits from multiple):
@implementation CallbackAsyncClass {
void (^_loginCallback) (NSDictionary *response);
}
// …
- (void)loginWithCallback:(void (^) (NSDictionary *response))handler {
// Do something async / call URL
...
How to set up a git project to use an external repo submodule?
...to reference and use. Assuming you already have MyWebApp set up as a repo, from terminal issue these commands:
cd MyWebApp
git submodule add git://github.com/jquery/jquery.git externals/jquery
This will create a directory named externals/jquery* and link it to the github jquery repository. Now we...
GCC -g vs -g3 GDB Flag: What is the Difference?
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From the docs:
-g
Produce debugging information in the operating system's native format (stabs, COFF, XCOFF, or DWARF 2). GDB can work with this
debugging information. On most systems that use stabs format, -g
enables use of...
find -exec cmd {} + vs | xargs
...tly. Also lots of people do not know this "-exec cmd {} +", as you can see from other answers.
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Detecting an undefined object property
...this method is the only way of referring to an undeclared (note: different from having a value of undefined) identifier without an early error:
if(typeof myVariable === 'undefined') {
alert('myVariable is either the special value `undefined`, or it has not been declared');
}
In versions of Java...
Should try…catch go inside or outside a loop?
...aught" body of such "catch-all" methods, to more clearly separate the body from the all-enclosing try block.
– Thomas W
Oct 18 '13 at 5:06
...
How to run JUnit tests with Gradle?
...lasses with both gradle and you IDE. I use Eclipse, and when running JUnit from it, Eclipse chooses one classpath (the bin directory) whereas gradle chooses another (the build directory). This can lead to confusion if you edit a resource file, and don't see your change reflected at test runtime.
...
matplotlib colorbar for scatter
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From the matplotlib docs on scatter 1:
cmap is only used if c is an array of floats
So colorlist needs to be a list of floats rather than a list of tuples as you have it now.
plt.colorbar() wants a mappable object, like...