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What does the “Just” syntax mean in Haskell?
...ut it has proven to be an effective way to do it.
Maybe as a Functor
The idea of transforming one type to another one such that operations on the old type can also be transformed to work on the new type is the concept behind the Haskell type class called Functor, which Maybe a has a useful instanc...
Disadvantages of Test Driven Development? [closed]
...quires mocks / stubs. And programming against an interface is often a good idea, same goes for patterns. If you mix UI and logic you will have a bad time. If you have to test DB interaction you can still mock your DAO for the unit tests and use the real thing for an integration test.
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Why use Object.prototype.hasOwnProperty.call(myObj, prop) instead of myObj.hasOwnProperty(prop)?
...ther hasOwnProperty method instead without first testing if that is a good idea or not.
Edit
I suspect that the reason for using Object.prototype.hasOwnProperty.call is that in some browsers, host objects don't have a hasOwnProperty method, using call and the built–in method is an alternative. H...
EJB's - when to use Remote and/or local interfaces?
...h most of what is written above, I would like to refine the "how to start" ideas a bit.
My suggestion to you is to never ever program directly to EJB interfaces within your code. Always use a regular, business-oriented interface, program to it (meaning, have your code call methods on the business-o...
Why not inherit from List?
... not model a football team as a list of players. In fact it might be a bad idea to model a football team as having a list of players too. The problem with a team as/having a list of players is that what you've got is a snapshot of the team at a moment in time. I don't know what your business case is...
Java HashMap performance optimization / alternative
...create a large HashMap but the put() performance is not good enough. Any ideas?
25 Answers
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Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...rseTable256[p[2]];
q[0] = BitReverseTable256[p[3]];
You can extend this idea to 64-bit ints, or trade off memory for speed (assuming your L1 Data Cache is large enough), and reverse 16 bits at a time with a 64K-entry lookup table.
Others
Simple
unsigned int v; // input bits to be reverse...
Why switch is faster than if
...d like to bring up is the famous Divide and Conquer. So my above 255 array idea could be reduced to no more then 8 if statements as a worst case scenario.
I.e. but keep in mind it get's messy and hard to manage fast and my other approach is generally better, but this is utilize in cases where array...
Which is faster: Stack allocation or Heap allocation
...loop at the very beginning of your main function, something to give you an idea how much time per loop-cycle you're getting, and adjust the other loops so as to ensure your example runs for some amount of time, instead of the fixed constant you're using.
– Joe Pineda
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Good or bad practice? Initializing objects in getter
...".
Short answer:
Using lazy initialization unconditionally is not a good idea. It has its places but one has to take into consideration the impacts this solution has.
Background and explanation:
Concrete implementation:
Let's first look at your concrete sample and why I consider its implementati...