terminology

I am using end() to set the internal pointer of an array to its last element. Then I am using key() to get the key of that last element. For example: $array = ('one' => 'fish', 'two' => 'fish', 'red' => 'fish', 'blue' => 'fish'); end($array) $last_key = key($array); The only thing that I do not understand is what the internal pointer of an array is exactly. Can someone explain it to me? I've been trying but cannot find an explanation. Also, how does setting the internal pointer of an array affect that array? There's an internal implementation for "arrays" in PHP "behind the scenes", written in

This answer from a Category Theory perspective includes the following statement: ...the truth is that there's no real distinction between co and contravariant functor, because every functor is just a covariant functor. ... More in details a contravariant functor F from a category C to a category D is nothing more than a (covariant) functor of type F : C op →D, from the opposite category of C to the category D. On the other hand, Haskell's Functor and Contravariant merely require fmap and contramap , respectively, to be defined for an instance. This suggests that, from the perspective of

What is a blocking function or a blocking call ? This is a term I see again and again when referring to Node.js or realtime processing languages. A function that stops script execution until it ends. For example, if I had a function in my language that was used to write to a file, like so: fwrite(file, "Contents"); print("Wrote to file!"); The print statement would only be executed once the file has been written to the disk. The whole program is halted on this instruction. This isn't noticeable for small enough writes, but imagine I had a huge blob to write to the file, one that took many

I need to know what the event loop in the ios life cycle does?. Can any one suggest me regarding this?? The best answer is probably the one provided by Apple in the "Main event loop" section of the Cocoa Application Competencies for iOS document. In the main event loop, an application continuously routes incoming events to objects for handling and, as a result of that handling, updates its appearance and state. An event loop is simply a run loop: an event-processing loop for scheduling work and coordinating the receipt of events from various input sources attached to the run loop. Every thread

I feel silly for asking this but it isn't like I could google this. What is the ` character called? In case it doesnt show up, it is the character used for inline code with markdown. Also, on most keyboards, it shares the key with ~ . I like all three answers so I made this a CW instead of accepting All sorts of things, but in programming mostly the back-quote or backtick, Grave (pronounced Grahv, not like the synonym for tomb) or Grave accent . From the Jargon file , the prime nerd reference which really should be an ISO standard :-) Common : backquote; left quote; left single quote; open