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How do I create directory if none exists using File class in Ruby?
...s in the stdlib: ruby-doc.org/stdlib-1.9.3/libdoc/fileutils/rdoc/FileUtils.html
– Eureka
Sep 27 '12 at 8:59
Oh ok. I m...
How can I implement prepend and append with regular JavaScript?
...mentById("theParent");
theKid = document.createElement("div");
theKid.innerHTML = 'Are we there yet?';
// append theKid to the end of theParent
theParent.appendChild(theKid);
// prepend theKid to the beginning of theParent
theParent.insertBefore(theKid, theParent.firstChild);
theParent.firstChil...
Global and local variables in R
...nding how to use them:
http://stat.ethz.ch/R-manual/R-devel/library/base/html/environment.html
http://stat.ethz.ch/R-manual/R-devel/library/base/html/get.html
Here you have a small example:
test.env <- new.env()
assign('var', 100, envir=test.env)
# or simply
test.env$var <- 100
get('var...
Align contents inside a div
I use css style text-align to align contents inside a container in HTML. This works fine while the content is text or the browser is IE. But otherwise it does not work.
...
How to play a notification sound on websites?
...e" src="' + filename +'.mp3">';
document.getElementById("sound").innerHTML='<audio autoplay="autoplay">' + mp3Source + oggSource + embedSource + '</audio>';
}
<button onclick="playSound('bing');">Play</button>
<div id="sound"></div>
Browser support
<a...
Override body style for content in an iframe
...Uncaught DOMException: Failed to read the 'contentDocument' property from 'HTMLIFrameElement': Blocked a frame with origin "xxxxxxxxx.com" from accessing a cross-origin frame.
– Alex Stanese
Dec 9 '16 at 8:50
...
JavaScript dependency management: npm vs. bower vs. volo [closed]
... modules called packages and Bower manages front-end components (i.e. css, html, and JavaScript) called components. npm is also used to install bower. Here is an expansive article on npm and bower (does not cover volo) it goes into plenty of detail.
...
Java: random long number in 0
...ccording to https://docs.oracle.com/javase/1.5.0/docs/api/java/util/Random.html nextInt is implemented as
public int nextInt(int n) {
if (n<=0)
throw new IllegalArgumentException("n must be positive");
if ((n & -n) == n) // i.e., n is a power of 2
return...
Getting the minimum of two values in SQL
...inks :
MySQL http://dev.mysql.com/doc/refman/5.0/en/comparison-operators.html
Postgres https://www.postgresql.org/docs/current/functions-conditional.html
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Retrieve a single file from a repository
...config option. See https://kernel.org/pub/software/scm/git/docs/git-daemon.html
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