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List of Big-O for PHP functions
After using PHP for a while now, I've noticed that not all built-in PHP functions are as fast as expected. Consider these two possible implementations of a function that finds if a number is prime using a cached array of primes.
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What is the difference between NTFS Junction Points and Symbolic Links?
...g. To be compatible with legacy folder names, C:\Documents and Settings is now a link to C:\Users.
Interestingly, although Vista introduces Symbolic links, this "Documents and Settings" trick is actually a plain old junction.
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What is the difference between user and kernel modes in operating systems?
...inology).
Entered with the svc instruction (SuperVisor Call), previously known as swi before unified assembly, which is the instruction used to make Linux system calls. Hello world ARMv8 example:
hello.S
.text
.global _start
_start:
/* write */
mov x0, 1
ldr x1, =msg
ldr x2, =len
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If Python is interpreted, what are .pyc files?
.... Hence why we call it a VM ? Like Esperanto for assembly language really. Nowadays we even have native code for fictional (but still emulated) CPU's (Mojang's effort to get the kiddies interested). Rexx was (or could be) truly interpreted, and BAT and CMD (and DCL) are interpreted.
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What is the maximum possible length of a query string?
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And now I have a reason I can tell the backend engineers that we won't accept a list of one hundred 36 character UUIDs in the queryParams of a GET request. Thanks!
– Mordred
Jan 15 at 22:37
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Why do you program in assembly? [closed]
...e heck out of them in assembly. Or, if they're already experienced, they know which parts are going to be bottlenecks, and they've got optimized pieces sitting around from other games they've built.
The point of programming in assembly is the same as it always has been: speed. It would be ridicul...
Is it .yaml or .yml?
...ioned factors may have been the main ones; nevertheless, all the factors (known or unknown) have resulted in the abbreviated, three (3) character extension becoming the one in predominant use for YAML—despite the inventors' preference.
".YML" seems to be the de facto standard. Yet the same invent...
reference assignment is atomic so why is Interlocked.Exchange(ref Object, Object) needed?
...ram is right because you understand how it works, not right by accident.)
Now suppose you make a variable which is an alias of a volatile field by passing a ref to that field. Inside the called method, the compiler has no reason whatsoever to know that the reference needs to have volatile semantics...
Best Practices: Salting & peppering passwords?
...provable or the maintainable models...
Theoretical Problems With Peppers
Now that we've set the stage, let's look at what's wrong with peppers.
Feeding one hash into another can be dangerous.
In your example, you do hash_function($salt . hash_function($pepper . $password)).
We know from past e...
What are the differences between Clojure, Scheme/Racket and Common Lisp?
I know they are dialects of the same family of language called lisp, but what exactly are the differences? Could you give an overview, if possible, covering topics such as syntax, characteristics, features and resources.
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