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ReactJS: Modeling Bi-Directional Infinite Scrolling
...llocate them and discard them. If 10k allocations is too big, you can instead pass a function that takes a range and return the elements.
<List>
{thousandelements.map(function() { return <Element /> })}
</List>
Your List component is keeping track of what the scroll position i...
angular.service vs angular.factory
...yServiceFunction);
angular.factory('myFactory', myFactoryFunction);
I had trouble wrapping my head around this concept until I put it to myself this way:
Service: the function that you write will be new-ed:
myInjectedService <---- new myServiceFunction()
Factory: the function (constructo...
Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala
...ickier to explain. Reduce is defined formally as part of the MapReduce paradigm, which deals with orderless collections (multisets), Fold is formally defined in terms of recursion (see catamorphism) and thus assumes a structure / sequence to the collections.
There is no fold method in Scalding bec...
'printf' vs. 'cout' in C++
...se from C). Now, I'll be honest here; both printf and std::cout have their advantages.
Real differences
Extensibility
std::cout is extensible. I know that people will say that printf is extensible too, but such extension is not mentioned in the C standard (so you would have to use non-standard fe...
Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...y to generate noticeably faster code if I optimize for size ( -Os ) instead of speed ( -O2 or -O3 ), and I have been wondering ever since why.
...
Getting started with Haskell
For a few days I've tried to wrap my head around the functional programming paradigm in Haskell. I've done this by reading tutorials and watching screencasts, but nothing really seems to stick.
Now, in learning various imperative/OO languages (like C, Java, PHP), exercises have been a good way for m...
PHP parse/syntax errors; and how to solve them
...w basic precautions you can always take:
Use proper code indentation, or adopt any lofty coding style.
Readability prevents irregularities.
Use an IDE or editor for PHP with syntax highlighting.
Which also help with parentheses/bracket balancing.
Read the language reference and examples in the m...
How to limit setAccessible to only “legitimate” uses?
...Object.setAccessible , the more astonished I am at what it can do. This is adapted from my answer to the question ( Using reflection to change static final File.separatorChar for unit testing ).
...
When to use Storyboard and when to use XIBs
...een storyboards.
You still need XIBs: In both of my Storyboard projects I had to use XIBs for custom table cells.
I think Storyboards are a step in the right direction for UI implementation and hope Apple will extend them in future iOS versions. They need to resolve the "single file" issue though,...
Peak signal detection in realtime timeseries data
... # No signal
set filteredY(i) to y(i);
end
# Adjust the filters
set avgFilter(i) to mean(filteredY(i-lag),...,filteredY(i));
set stdFilter(i) to std(filteredY(i-lag),...,filteredY(i));
end
Rules of thumb for selecting good parameters for your data can be found belo...