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Memoization in Haskell?
... `div` 4)
You can get an unmemoized f by using fix f
This will let you test that f does what you mean for small values of f by calling, for example: fix f 123 = 144
We could memoize this by defining:
f_list :: [Int]
f_list = map (f faster_f) [0..]
faster_f :: Int -> Int
faster_f n = f_list...
When should I use C++14 automatic return type deduction?
...is garbage that shouldn't be used. I also know some who think its the greatest thing to happen to C++. In either case I think there are some interesting discussions to be had on it, but its really an exact example of the close as not constructive option on this site.
– Gabe S...
When to choose checked and unchecked exceptions
...y compiler. These
runtime exceptions will uncover in
development, and testing period. Then
we have to refactor our code to remove
these errors.
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How do BitTorrent magnet links work?
...t tries that 6 times, waiting 40(!) seconds between tries. I guess you can test it by deleting the config files (~/.config/transmission on unix), and blocking all communication to dht.transmissionbt.com, and see what happens (wait 240 seconds at least).
So it appears the client has a bootstrap node...
How do I discover memory usage of my application in Android?
...d memory in a graph, and garbage collection
events over time.
Quickly testing whether app slowness might be
related to excessive garbage collection events.
Quickly testing
whether app crashes may be related to running out of memory.
Figure 1. Forcing a GC (Garbage Collection) even...
Please explain some of Paul Graham's points on Lisp
...gt; STRING
2) A symbol type. Symbols differ from strings in that you can test equality by comparing a pointer.
A symbol is a data object with a name. Usually the name can be used to find the object:
|This is a Symbol|
this-is-also-a-symbol
(find-symbol "SIN") -> SIN
Since symbols are re...
Is it possible to set the equivalent of a src attribute of an img tag in CSS?
.../SZ8Cm.jpg");
}
</style>
<img class="MyClass123"/>
Tested and working:
Chrome 14.0.835.163
Safari 4.0.5
Opera 10.6
Tested and Not working:
FireFox 40.0.2 (observing Developer Network Tools, you can see that the URL loads, but the image is not displayed)
Internet Expl...
No ConcurrentList in .Net 4.0?
...This was the goal of my ConcurrentList<T> implementation. But when I tested its performance in multithreaded scenarios, I found that simply synchronizing adds to a List<T> was faster. Basically, adding to a List<T> is lightning fast already; the complexity of the computational step...
Calling clojure from java
... This example used the Clojure-1.1.0 jar.
Update: This answer has been re-tested using the following tools:
Clojure 1.5.1
Leiningen 2.1.3
JDK 1.7.0 Update 25
The Clojure Part
First create a project and associated directory structure using Leiningen:
C:\projects>lein new com.domain.tiny
N...
Which parts of Real World Haskell are now obsolete or considered bad practice?
...een replaced with more general Foldable t => t a variants.
Chapter 11. Testing and quality assurance
Since Haskell-platform 2010 or late 2008.
Although this is mentioned in a footnote, the QuickCheck library has changed in many ways from version 1 to version 2. For example, generate now uses G...