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How to identify unused css definitions
...l and it shows me the unused css, but how to use it then? Do I have to manually search each item and remove it?
– Timothée HENRY
Feb 27 '13 at 14:35
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How to generate a Dockerfile from an image?
...;image_id>
-f, --full-tree Generate Dockerfile for all parent layers
-h, --help Show this message
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Why don't C++ compilers define operator== and operator!=?
...implement it and let the programmer do that themselves. Then they can make all the assumptions they like.
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HTTP headers in Websockets client API
...he first message after the connection is established. The server then only allows the connection to continue if the ticket is valid (exists, has not been already used, client IP encoded in ticket matches, timestamp in ticket is recent, etc). Here is a summary of WebSocket security information: https...
What's the difference between fill_parent and wrap_content?
... value:
android:layout_width="100dp"
android:layout_height="200dp"
Generally that is not as good, though, because it is not as flexible for different sized devices. After you have understood wrap_content and match_parent, the next thing to learn is layout_weight.
See also
What does android:lay...
How to count occurrences of a column value efficiently in SQL?
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If you're using Oracle, then a feature called analytics will do the trick. It looks like this:
select id, age, count(*) over (partition by age) from students;
If you aren't using Oracle, then you'll need to join back to the counts:
select a.id, a.age, b.age_co...
How to simulate a click by using x,y coordinates in JavaScript?
...sed to trick a cross-domain iframe document into thinking it was clicked.
All modern browsers support document.elementFromPoint and HTMLElement.prototype.click(), since at least IE 6, Firefox 5, any version of Chrome and probably any version of Safari you're likely to care about. It will even foll...
Is there a “do … while” loop in Ruby?
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It looks like the begin-end-while loop is actually evaluating the condition before running the loop. The difference between that and a regular while loop is that it's guaranteed to run at least once. It's just close enough to do...while to cause problems.
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Test if a class has an attribute?
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to only check if the attribute is present, which is usually all that is needed for parameterless/propertyless attributes, it's cheaper to use .IsDefined, as it will query the metadata, and not deserialize and instantiate the attribute object.
– Lasse V. Karl...
Best practice to validate null and empty collection in Java
...evaluate the right operand. So if m == null, then m.isEmpty() will not be called (not needed, the result is true).
– icza
Jul 29 '16 at 9:05
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