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How to remove all whitespace from a string?
...ical tab, form feed
x <- c(
" x y ", # spaces before, after and in between
" \u2190 \u2192 ", # contains unicode chars
paste0( # varied whitespace
whitespace,
"x",
whitespace,
"y",
whitespace,
collapse = ""
),
NA ...
Best way to add page specific JavaScript in a Rails 3 app?
...like to do is include the per-view Javascript in a content_for :head block and then yield to that block in your application layout. For example
If it's pretty short then:
<% content_for :head do %>
<script type="text/javascript">
$(function() {
$('user_rating_positve').clic...
Retrieving the inherited attribute names/values using Java Reflection
...om 'ParentObj'. Now, if it is possible to retrieve all the attribute names and values of ChildObj, including the inherited attributes too, using Java reflection mechanism?
...
Facebook Like Button - how to disable Comment pop up?
... display: none !important;
}
Put the CSS style in any of your CSS file and see the magic, it works :)
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What is SELF JOIN and when would you use it? [duplicate]
What is self join and when would you use it? I don't understand self joins so a layman explanation with an example would be great.
...
How to make rpm auto install dependencies
...
Create a (local) repository and use yum to have it resolve the dependencies for you.
The CentOS wiki has a nice page providing a how-to on this. CentOS wiki HowTos/CreateLocalRepos.
Summarized and further minimized (not ideal, but quickest):
Creat...
How does one capture a Mac's command key via JavaScript?
...is not going to be captured by browsers as such.
This is only for the command key on MacOS/keyboards.
Unlike Shift/Alt/Ctrl, the Cmd (“Apple”) key is not considered a modifier key—instead, you should listen on keydown/keyup and record when a key is pressed and then depressed based on event...
With Spring can I make an optional path variable?
...es, in my opinion. The combinatorial proliferation can quickly get out of hand.
– skaffman
Feb 5 '11 at 11:40
9
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Where do I find the line number in the Xcode editor?
...
For Xcode 4 and higher, open the preferences (command+,) and check "Show: Line numbers" in the "Text Editing" section.
Xcode 9
XCode 8 and below
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How to select the nth row in a SQL database table?
...
There are ways of doing this in optional parts of the standard, but a lot of databases support their own way of doing it.
A really good site that talks about this and other things is http://troels.arvin.dk/db/rdbms/#select-limit.
Basically, PostgreSQL and MySQL supports the non-...