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Is there a standard function to check for null, undefined, or blank variables in JavaScript?
...n the specification at the ToBoolean section.
Furthermore, if you do not know whether a variable exists (that means, if it was declared) you should check with the typeof operator. For instance
if( typeof foo !== 'undefined' ) {
// foo could get resolved and it's defined
}
If you can be sure ...
Forward declaration of a typedef in C++
...PA;
void func(PA x);
// baz.cc
#include "bar.h"
#include "foo.h"
// We've now included the definition for PA twice, but it's ok since they're the same
...
A x;
func(&x);
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What is the Simplest Way to Reverse an ArrayList?
...T element = list.get(i);
result.add(element);
}
// result now holds a reversed copy of the original list
return result;
}
This is more efficient, but also more verbose.
Alternatively, we can rewrite the above to use Java 8's stream API, which some people find more concise and...
Regex Match all characters between two strings
...
Just one note - regexr says now that lookbehind is not supported in javascript
– Kovo
Apr 14 '14 at 10:53
2
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Retrieving the output of subprocess.call() [duplicate]
...play results?")
print output
#... and on to the selection process ...
You now have the output of the command stored in the variable "output". "stdout = subprocess.PIPE" tells the class to create a file object named 'stdout' from within Popen. The communicate() method, from what I can tell, just a...
Git: Cannot see new remote branch
...ojects/projectX
* [new branch] release/1.0.5 -> release/1.0.5
Now you have also the refs locally, you checkout (or whatever) this branch.
Job done!
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How to remove a key from a Python dictionary?
...
help() and dir() can be your friends when you need to know what something does.
– David Mulder
Aug 6 '13 at 18:08
3
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in a “using” block is a SqlConnection closed on return or exception?
...
Did you know you can stack using statements without additional braces? Delete the last brace, then place the using statements next to each other :)
– NickG
Aug 28 '14 at 14:42
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Javascript callback when IFRAME is finished loading?
...
});
It seems as you delete you iFrame before you grab the html from it. Now, I do see a problem with that :p
Hope this helps :).
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What is InnoDB and MyISAM in MySQL?
...s InnoDB as of MySQL 5.5.5 (MyISAM before 5.5.5)" So the default engine is now InnoDB. This answer was posted 16 days after the first general-availability release with InnoDB as the default engine ;)
– SOFe
Feb 23 '18 at 16:58
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