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Difference between objectForKey and valueForKey?
...: valueForKey can be intensely slow - it's currently a major bottleneck in my iPad app, so slow that replacing it with a "standard" dictionary made the app noticeably faster. Something very wrong with KVC on iOS, and I'll never use it again - not worth the drop in performance, and having to re-write...
Find the nth occurrence of substring in a string
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Can this be done in a string? Like find_nth(df.mystring.str, ('x'), 2) to find the position of the 2nd instance of 'x'?
– Arthur D. Howland
May 23 '18 at 14:54
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How to use concerns in Rails 4
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So I found it out by myself. It is actually a pretty simple but powerful concept. It has to do with code reuse as in the example below. Basically, the idea is to extract common and / or context specific chunks of code in order to clean up the mod...
What is the difference between NTFS Junction Points and Symbolic Links?
...aying is that an NTFS Junction is not an NTFS Symbolic Link. I can see how my wording might be misunderstood to say this. I'll edit to clarify, but the point is that, in this context, "symbolic link" refers to NTFS Symbolic Links which are specific implementations of the more general "symbolic link"...
Are duplicate keys allowed in the definition of binary search trees?
...ns for 'travel', or it is done (successfully or not.) So I apologize that my original answer didn't address the concept of a 'universal definition', as duplicates are really a distinct topic (something you deal with after a successful search, not as part of the binary search.)
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Targeting position:sticky elements that are currently in a 'stuck' state
...imitations exist that make these non-trivial to implement. I wouldn't hold my breath for a pure CSS solution to this problem anytime soon.
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Using node.js as a simple web server
...ttp-server -g
Now you can run a server via the following commands:
$ cd MyApp
$ http-server
If you're using NPM 5.2.0 or newer, you can use http-server without installing it with npx. This isn't recommended for use in production but is a great way to quickly get a server running on localhost...
Correct file permissions for WordPress [closed]
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The problem I experience is anytime I make my SSH "user" the owner of /wp-content/plugins/, Wordpress becomes completely unfunctional from within the admin, with the constant FTP pop-up routine or permissions errors. Cannot add, nor update plugins. Only when I make ...
Does ruby have real multithreading?
...of ruby using green threads . How can I create real "OS-level" threads in my application in order to make use of multiple cpu cores for processing?
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How to pass arguments and redirect stdin from a file to program run in gdb?
...ed $ gdb ./a.out then (gdb) r < t arg1 arg2 which works fine for me. In my case a.out = nft arg1 = import arg2 = json and t = file containing json rules
– Zzz0_o
Aug 2 '17 at 10:27
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