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What is the purpose of “&&” in a shell command?
...
See the example:
mkdir test && echo "Something" > test/file
Shell will try to create directory test and then, only if it was successfull will try create file inside it.
So you may interrupt a sequence of steps if one of them failed.
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Convert NaN to 0 in javascript
... 0;
...which will have the same effect as above.
If the intent was to test for more than just NaN, then you can do the same, but do a toNumber conversion first.
a = +a || 0
This uses the unary + operator to try to convert a to a number. This has the added benefit of converting things like nu...
Ruby : How to write a gem? [closed]
...d publishing a gem
Let's Write a Gem
How To Build A Ruby Gem With Bundler, Test-Driven Development, Travis CI And Coveralls, Oh My!
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How to set caret(cursor) position in contenteditable element (div)?
...pan tag like this : <<div id="editable" contenteditable="true"> test1<br>test2<br><span></span> </div>
– Med Akram Z
Mar 29 '12 at 1:21
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Determine if string is in list in JavaScript
...'b')
This has some inherent benefits over indexOf because it can properly test for the presence of NaN in the list, and can match missing array elements such as the middle one in [1, , 2] to undefined. includes also works on JavaScript typed arrays such as Uint8Array.
If you're concerned about brow...
How to convert array to SimpleXML
...
a short one:
<?php
$test_array = array (
'bla' => 'blub',
'foo' => 'bar',
'another_array' => array (
'stack' => 'overflow',
),
);
$xml = new SimpleXMLElement('<root/>');
array_walk_recursive($test_array, array ($xml...
Is it possible in Java to access private fields via reflection [duplicate]
...public void setStr(String value)
{
str = value;
}
}
class Test
{
public static void main(String[] args)
// Just for the ease of a throwaway test. Don't
// do this normally!
throws Exception
{
Other t = new Other();
t.setStr("hi");
...
Error when testing on iOS simulator: Couldn't register with the bootstrap server
I was testing my app on the simulator when it crashed on clicking a button of a UIAlertView. I stopped debugging there, made some changes to the code and built the app again. Now when I run the application, I get this error in the console
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Recursively list files in Java
... Files.walk, mostly because there are overloads and it's more convenient.
TESTS: As requested I've provided a performance comparison of many of the answers. Check out the Github project which contains results and a test case.
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Can an interface extend multiple interfaces in Java?
...same name and signature?
There is a tricky point:
interface A {
void test();
}
interface B {
void test();
}
class C implements A, B {
@Override
public void test() {
}
}
Then single implementation works for both :).
Read my complete post here:
http://codeinventions...