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How to map and remove nil values in Ruby
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Ruby 2.7+
There is now!
Ruby 2.7 is introducing filter_map for this exact purpose. It's idiomatic and performant, and I'd expect it to become the norm very soon.
For example:
numbers = [1, 2, 5, 8, 10, 13]
enum.filter_map { |i| i * 2 if i.even? }
# => [4, 16, 20]
In your ...
csv.Error: iterator should return strings, not bytes
...utf-8'".
– covfefe
Oct 16 '15 at 22:06
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Why am I getting a NoClassDefFoundError in Java?
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edited Mar 11 '18 at 21:06
answered Feb 13 '15 at 19:20
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What is Node.js? [closed]
...through one jack-of-all-trades Node.js service ... "app.use(express.static(__dirname + '/public'))". For lower-load services and development, that's probably fine. But as soon as you try to put big time load on your service and have it run 24/7, you'll quickly discover the motivations that push big ...
How to generate an entity-relationship (ER) diagram using Oracle SQL Developer
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Click on the «Browser» tab, expand the design (probably called Untitled_1), right-click «Relational Models» and select «New Relational Model».
Right click on the newly created relational model (probably Relational_1) and select «Show».
Then just drag the tables you want (from e.g. the «Co...
iPhone: Detecting user inactivity/idle time since last screen touch
...f the screen receives a touch, the timer is reset.
override func sendEvent(_ event: UIEvent) {
super.sendEvent(event)
if idleTimer != nil {
self.resetIdleTimer()
}
if let touches = event.allTouches {
for touch in touches {
if touch.phase == UITouchPhase....
How to properly import a selfsigned certificate into Java keystore that is available to all Java app
...se: System.out.println(System.getProperty("java.home"));
Copy the file JAVA_HOME\lib\security\cacerts to another folder.
In Portecle click File > Open Keystore File
Select the cacerts file
Enter this password: changeit
Click Tools > Import Trusted Certificate
Browse for the file mycertificate....
animating addClass/removeClass with jQuery
... tw16tw16
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Should one call .close() on HttpServletResponse.getOutputStream()/.getWriter()?
...f it not closed.
public void close() throws IOException
{
if (_closed)
return;
if (!isIncluding() && !_generator.isCommitted())
commitResponse(HttpGenerator.LAST);
else
flushResponse();
super.close();
}
Also as ...
Do AJAX requests retain PHP Session info?
If I had a user logged onto my site, having his id stored in $_SESSION , and from his browser he clicked a 'Save' button which would make an AJAX request to the server. Will his $_SESSION and cookies be retained in this request, and can I safely rely on the id being present in the $_SESSION ?
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