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What does the “map” method do in Ruby?
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The map method takes an enumerable object and a block, and runs the block for each element, outputting each returned value from the block (the original object is unchanged unless you use map!):
[1, 2, 3].map { |n| n * n } #=> [1, 4, 9]
Array and Range are enumerable ...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...chusetts Avenue, Cambridge, MA 02139, USA
ABSTRACT
MIT App Inventor is a block-based event-driven programming tool that allows everyone, especially novices, to start programming and building fully functional apps for Android devices. Compared to traditional text programming with Android Studio, it...
How to remove only underline from a:before?
... of the inline element from display:inline (the default) to display:inline-block:
#test p a:before {
color: #B2B2B2;
content: "► ";
display:inline-block;
}
This is because the CSS specs say:
When specified on or propagated to an inline element, it affects all the boxes generated...
make an html svg object also a clickable link
...bject> tag, use:
pointer-events: none;
Note: Users which have the Ad Blocker plugin installed get a tab-like [Block] at the upper right corner upon hovering (the same as a flash banner gets). By settings this css, that'll go away as well.
http://jsfiddle.net/energee/UL9k9/
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Context switches much slower in new linux kernels
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Perhaps what got slower is futex, the building block for condition variables. This will shed some light:
strace -r ./test_latency 0 1 &> test_latency_strace & sleep 8 && killall test_latency
then
for i in futex nanosleep rt_sig;do echo $i;grep $i te...
Why invoke Thread.currentThread.interrupt() in a catch InterruptException block?
Why invoke the method Thread.currentThread.interrupt() in the catch block?
5 Answers
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Facebook Post Link Image
...TML is valid - and the same goes for your javascript and server-side code (PHP, ASP, etc.). I had a small PHP error in a piece of code that was executing as a separate call to the server from the main page. Due to a number of bizarre coincidences, that code was generating a 500 error - but ONLY for ...
What is Double Brace initialization in Java?
...d from the specified class (the outer braces), and provides an initialiser block within that class (the inner braces). e.g.
new ArrayList<Integer>() {{
add(1);
add(2);
}};
Note that an effect of using this double brace initialisation is that you're creating anonymous inner classes. Th...
Is there a Google Voice API? [closed]
...
Well...
These are PHP.
There is an sms one from google here.
And github has one here.
Another sms one is here. However, this one has a lot more code, so it may take up more space.
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Try-finally block prevents StackOverflowError
...'t run forever. Each stack overflow causes the code to move to the finally block. The problem is that it will take a really, really long time. The order of time is O(2^N) where N is the maximum stack depth.
Imagine the maximum depth is 5
foo() calls
foo() calls
foo() calls
fo...