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How do I tell if a regular file does not exist in Bash?
...amation point (similar to many other languages). Try this:
if [ ! -f /tmp/foo.txt ]; then
echo "File not found!"
fi
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What is JSONP, and why was it created?
...Without JSONP, this might return some basic JavaScript object, like so:
{ foo: 'bar' }
However, with JSONP, when the server receives the "callback" parameter, it wraps up the result a little differently, returning something like this:
mycallback({ foo: 'bar' });
As you can see, it will now inv...
How to check if object has any properties in JavaScript?
...can have non–enumerable own properties, e.g. Object.defineProperty(obj, 'foo', {enumerable:false, value:'foo'}).
– RobG
Jun 4 '14 at 3:35
...
HTML5 Video Dimensions
...
<video id="foo" src="foo.mp4"></video>
var vid = document.getElementById("foo");
vid.videoHeight; // returns the intrinsic height of the video
vid.videoWidth; // returns the intrinsic width of the video
Spec: https://html.sp...
How to output in CLI during execution of PHP Unit tests?
...est output using the built-in methods like:
$this->expectOutputString('foo');
However, sometimes it's helpful to be naughty and see one-off/temporary debugging output from within your test cases. There is no need for the var_dump hack/workaround, though. This can easily be accomplished by sett...
In Java, are enum types inside a class static?
...r class they'd break the enum guarantee -
e.g. if you had
public class Foo {
private enum Bar {
A, B, C;
}
}
For the enum values to properly act as constants, (psuedocode, ignoring access restrictions)
Bar b1 = new Foo().A
Bar b2 = new Foo().A
b1 and b2 would have to be the s...
Detect when an image fails to load in Javascript
...eNotFound() {
alert('That image was not found.');
}
testImage("http://foo.com/bar.jpg");
And my sympathies for the jQuery-resistant boss!
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python re.sub group: number after \number
How can I replace foobar with foo123bar ?
1 Answer
1
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Using backticks around field names
...th it,
you'll note if you run your query as such
EXPLAIN EXTENDED Select foo,bar,baz
The generated warning that comes back will have back-ticks and fully qualified table names. So if you're using query generation features and automated re-writing of queries, backticks would make anything parsin...
Creating a simple XML file using python
...>
${document_list}
</doc>
</root>
""")
data = [
(1, 'foo', 'The value for the foo document'),
(2, 'bar', 'The <value> for the <bar> document'),
]
inner_contents = [inner_template.substitute(id=id, name=name, value=escape(value)) for (id, name, value) in data]
r...