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What are the differences between virtual memory and physical memory?
...pecific implementations of virtual memory, most likely paging. There is no one way to do paging - there are many implementations and the one your textbook describes is likely not the same as the one that appears in real OSes like Linux/Windows - there are probably subtle differences.
I could blab a...
How does StartCoroutine / yield return pattern really work in Unity?
...oft referenced Unity3D coroutines in detail link is dead. Since it is mentioned in the comments and the answers I am going to post the contents of the article here. This content comes from this mirror.
Unity3D coroutines in detail
Many processes in games take place over the course of mult...
How are virtual functions and vtable implemented?
...le consists of addresses to the virtual functions for classes that contain one or more virtual functions. The object of the class containing the virtual function contains a virtual pointer that points to the base address of the virtual table in memory. Whenever there is a virtual function call, the ...
Is there a decorator to simply cache function return values?
...mple of an LRU cache for computing Fibonacci numbers:
@lru_cache(maxsize=None)
def fib(n):
if n < 2:
return n
return fib(n-1) + fib(n-2)
>>> print([fib(n) for n in range(16)])
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]
>>> print(fib.cache_in...
JPA EntityManager: Why use persist() over merge()?
EntityManager.merge() can insert new objects and update existing ones.
15 Answers
15
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Best way to represent a fraction in Java?
...inal static BigFraction ZERO = new BigFraction(BigInteger.ZERO, BigInteger.ONE, true);
public final static BigFraction ONE = new BigFraction(BigInteger.ONE, BigInteger.ONE, true);
/**
* Constructs a BigFraction with given numerator and denominator. Fraction
* will be reduced to lowest te...
How to check that a string is a palindrome using regular expressions?
...es and edges. Each edge is annotated with a letter from a finite alphabet. One or more nodes are special "accepting" nodes and one node is the "start" node. As each letter is read from a given word we traverse the given edge in the machine. If we end up in an accepting state then we say that the mac...
check if directory exists and delete in one command unix
...
Assuming $WORKING_DIR is set to the directory... this one-liner should do it:
if [ -d "$WORKING_DIR" ]; then rm -Rf $WORKING_DIR; fi
(otherwise just replace with your directory)
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Sourcemaps off by one line in Chrome, with Ruby on Rails, Webpack, and React JS
... by Webpack using the inline-source-map configuration setting are off by one line when I use the Chrome devtools debugger.
Webpack is set up inside a Ruby on Rails application to generate a concatenated, unminified JavaScript file composed of a couple dozen modules. Most of those modules are Reac...
Hidden features of Ruby
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I actually wrote an gem at one point to do this, but my code was (a) a mess, and (b) slow. I'm very glad that the functionality has made it into core.
– James A. Rosen
Dec 14 '09 at 13:47
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