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What does the construct x = x || y mean?
...".
It's shorthand for writing:
if (!title) {
title = "Error";
}
This kind of shorthand trick with boolean expressions is common in Perl too. With the expression:
a OR b
it evaluates to true if either a or b is true. So if a is true you don't need to check b at all. This is called short-circ...
sudo echo “something” >> /etc/privilegedFile doesn't work
This is a pretty simple question, at least it seems like it should be, about sudo permissions in Linux.
15 Answers
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String comparison in Python: is vs. == [duplicate]
...s in fact '' . When I changed it to !='' rather than is not '' , it worked fine.
4 Answers
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How to convert a string from uppercase to lowercase in Bash? [duplicate]
...,,}
echo $y # hello
z=${y^^}
echo $z # HELLO
Use only one , or ^ to make the first letter lowercase or uppercase.
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“Invalid JSON primitive” in Ajax processing
...ion.JavaScriptSerializer.serialize(obj);?
If it is a valid json object like {'foo':'foovalue', 'bar':'barvalue'} then jQuery might not send it as json data but instead serialize it to foor=foovalue&bar=barvalue thus you get the error "Invalid JSON primitive: foo"
Try instead setting the data ...
val() doesn't trigger change() in jQuery [duplicate]
...ent on a text box when I change its value with a button, but it doesn't work. Check this fiddle .
9 Answers
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How to stop an animation (cancel() does not work)
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How to verify multiple method calls with different params
...rther reading has led me to try using ArgumentCaptors and the following works, although much more verbose than I would like.
ArgumentCaptor<String> argument = ArgumentCaptor.forClass(String.class);
verify(errors, atLeastOnce()).add(argument.capture(), any(ActionMessage.class));
List<Stri...
How to tell if node.js is installed or not
...ns. What does one really need to do? I wanted to see if it was actually working. So I executed a script called hello.js. It went as such:
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Grepping a huge file (80GB) any way to speed it up?
...ightygigsfile.sql
It will also be faster if you copy your file to RAM disk.
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