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Version of Apache installed on a Debian machine
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This won't work if there are currently syntax error in your configuration files
– Wolfgang Fahl
Nov 28 '15 at 8:03
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Java Garbage Collection Log messages
...s correctly, I forgot the "+" and my JBoss would not start up, without any error message!
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How to simulate a click with JavaScript?
..., much like modern appliances, have made an old chore much easier and less error prone. It's not the solution for everyone, however, downvoting an answer that accurately answers the question using more concise, understandable syntax while being cross-browser compatible seems backwards. +1.
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How to execute mongo commands through shell scripts?
...ate({\"name\":\"foo\"},{$set:{\"this\":\"that\"}});"
> E QUERY SyntaxError: Unexpected token :
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How can I convert a string to a number in Perl?
...wever, if $var is string could not be converted to numeric, you'll get the error, and $var will be reset to 0:
my $var = 'abc123';
print "var = $var\n";
$var += 0;
print "var = $var\n";
logs
var = abc123
Argument "abc123" isn't numeric in addition (+) at test.pl line 7.
var = 0
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What does !! mean in ruby?
...pying from Matt Van Horn's answer with slight modifications:
1 ^ true
TypeError: can't convert true into Integer
!!1 ^ !!true
=> false
I used it to ensure two variables were either both nil, or both not nil.
raise "Inconsistency" if !!a ^ !!b
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Creating a “logical exclusive or” operator in Java
...ated.
This is especially useful if the second operand would results in an error.
e.g.
if (set == null || set.isEmpty())
// or
if (list != null && list.size() > 0)
However with XOR, you always have to evaluate the second operand to get the result so the only meaningful operation is ^.
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How can I do an UPDATE statement with JOIN in SQL Server?
...FAIK, this kind of operation would expect a scalar value and will throw an error if given a result set instead.
– Francis Lord
May 16 '17 at 16:31
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What's the difference between & and && in MATLAB?
...ntees a condition without which the second expression may cause a run-time error. e.g. d != 0 && 1/d vs d !=0 & 1/d - the first guarantees no division by zero, the second doesn't.
– Fraser
Nov 14 '16 at 17:06
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What reference do I need to use Microsoft.Office.Interop.Excel in .NET?
...ws 7 PC, but even after installing the PIA's on the server, I still get an error message about System.Runtime.Interop.COM components missing. The program breaks when I try to instantiate the Excel.Application() object. Is there anything else I'm missing?
– Melanie
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