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What's the meaning of “=>” (an arrow formed from equals & greater than) in JavaScript?
...
What It Is
This is an arrow function. Arrow functions are a short syntax, introduced by ECMAscript 6, that can be used similarly to the way you would use function expressions. In other words, you can often use them in place of expressions like function (foo)...
How to configure encoding in Maven?
...
OK, I found the problem.
I use some reporting plugins. In the documentation of the failsafe-maven-plugin (http://maven.apache.org/plugins/maven-failsafe-plugin/integration-test-mojo.html) I found, that the <encoding> configuration - of course - uses ${project.reporting.outputEncoding} by de...
What is the runtime performance cost of a Docker container?
...al to native performance and faster than KVM in every category.
The exception to this is Docker’s NAT — if you use port mapping (e.g., docker run -p 8080:8080), then you can expect a minor hit in latency, as shown below. However, you can now use the host network stack (e.g., docker run --ne...
detach all packages while working in R
...ould have simply answered the following.
lapply(paste('package:',names(sessionInfo()$otherPkgs),sep=""),detach,character.only=TRUE,unload=TRUE)
(edit: 6-28-19)
In the latest version of R 3.6.0 please use instead.
invisible(lapply(paste0('package:', names(sessionInfo()$otherPkgs)), detach, character...
Calling C/C++ from Python?
...
You should have a look at Boost.Python. Here is the short introduction taken from their website:
The Boost Python Library is a framework for interfacing Python and
C++. It allows you to quickly and seamlessly expose C++ classes
functions and objects to Python, and vice-versa, using n...
What is the difference between Normalize.css and Reset CSS?
...size rendering for pre, SVG overflow in IE9, and the button styling bug in iOS.
Normalize.css doesn't clutter your dev tools. A common irritation when using reset.css is the large inheritance chain that is displayed in browser CSS debugging tools. This is not such an issue with normalize.css because...
Where is array's length property defined?
...a simple attribute named length which is final.
There is no "class definition" of an array (you can't find it in any .class file), they're a part of the language itself.
10.7. Array Members
The members of an array type are all of the following:
The public final field length, which ...
Using [UIColor colorWithRed:green:blue:alpha:] doesn't work with UITableView seperatorColor?
... I created a very simple UIColor category that does the messy looking division by itself: (from http://github.com/Jon889/JPGeneral)
//.h file
@interface UIColor (JPExtras)
+ (UIColor *)colorWithR:(CGFloat)red G:(CGFloat)green B:(CGFloat)blue A:(CGFloat)alpha;
@end
//.m file
@implementation UIColor...
What is the “main file” property when doing bower init?
...
According to the Bower.io documentation
main
Recommended Type: String or Array of String
The primary acting files necessary to use your package. While Bower
does not directly use these files, they are listed with the
commands...
What's the point of Spring MVC's DelegatingFilterProxy?
...t is, it finds a bean ("target bean" or "delegate") in your Spring application context and invokes it. How is it possible? Because this bean implements javax.servlet.Filter, its doFilter method is called.
Which bean is called? the DelegatingFilterProxy "Supports a "targetBeanName" [...], specifying...