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What does the “map” method do in Ruby?
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Ahhh I get it. So .map actually mutates the array while .each just loops through the array to access the values while leaving the original array untouched?
– bigpotato
Aug 23 '12 at 4:18
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Easy way to prevent Heroku idling?
...ynos seem to keep idling - my app has very low traffic but it's also not really acceptable in my case that my users have to wait 20+ seconds to spin up a new dyno.
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How can I center an absolutely positioned element in a div?
...html> element doesn't have a height specified so it takes the height of all the content in the document, which is nothing because the only content is absolutely-positioned (taken out of content flow). Adding height: 100% to the <html> element makes a difference to this.
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How to SSH to a VirtualBox guest externally through a host? [closed]
...ows 7 machine. How do I set it up so that I can access the webserver externally through SSH?
15 Answers
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How do I check for nulls in an '==' operator overload without infinite recursion?
...ccepted answer is a function, that executes the == of object. This is basically the same as the accepted answer, with one downside: It needs a cast. The accpeted answer is thus superior.
– Mafii
Jul 8 '16 at 12:43
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Why and when to use Node.js? [duplicate]
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It's evented asynchronous non-blocking I/O build ontop of V8.
So we have all the performance gain of V8 which is the Google JavaScript interpreter. Since the JavaScript performance race hasn't ended yet, you can expect Google to constantly update performance on V8 (for free).
We have non-blocking...
How to force garbage collection in Java?
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Your best option is to call System.gc() which simply is a hint to the garbage collector that you want it to do a collection. There is no way to force and immediate collection though as the garbage collector is non-deterministic.
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Integrated Markdown WYSIWYG text editor
...this (check out http://nightly-v4.ckeditor.com/3737/samples/bbcode.html).
All you have to do is implement this interface http://nightly-v4.ckeditor.com/ckeditor_api/#!/api/CKEDITOR.dataProcessor. If you check BBCode plugin's code you'll see some hacks and tricks, because unfortunately current CKEdi...
How do I rename an open file in Emacs?
...-buffer-modified-p nil))))))
Take a look at that page, there's another really useful related function there, called "move-buffer-file".
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“Invalid signature file” when attempting to run a .jar
...nch more files to the jar, and thus the signature is not correct. If you really wanted, you could re-sign the new jar, but of course it would be with your signature, not the old one. Alternatively, you could not distribute the uber jar, but instead include the signed jar as a separate file, but then...