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Please explain the exec() function and its family
...e passed as a list of strings to the main()
v : arguments are passed as an array of strings to the main()
p : path/s to search for the new running program
e : the environment can be specified by the caller
You can mix them, therefore you have:
int execl(const char *path, const char *arg, ...);
i...
Java 8: Lambda-Streams, Filter by Method with Exception
..."a");
}
}
List<Account> accounts = new ArrayList<>(Arrays.asList(new Account("andrey"), new Account("angela"), new Account("pamela")));
Stream<Account> s = accounts.stream();
s
.filter(a -> propagate(a::isActive))
...
Why were pandas merges in python faster than data.table merges in R in 2012?
... to these kinds of operations than R's data.frame (which is just a list of arrays internally).
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What are the benefits of dependency injection containers?
...terators, nearly anything with annotations, anything that initializes with arrays. Most great programming structures are an attempt to separate out the differences in your code and combine what's left, driving it with something that can be grouped and managed better.
– Bill K
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What is in your .vimrc? [closed]
...hile
return long_line_lens
endfunction
"find the median of the given array of numbers
function! s:Median(nums)
let nums = sort(a:nums)
let l = len(nums)
if l % 2 == 1
let i = (l-1) / 2
return nums[i]
else
return (nums[l/2] + nums[(l/2)-1]) / 2
endif...
What are the mathematical/computational principles behind this game?
...ve written actual C++ code but knowing that vector <something> is an array containing values of type something it's easy to understand what this code does. and this code generates P^2+P+1 cards using P^2+P+1 pictures each containing P+1 picture and sharing only 1 picture in common, for every p...
Is JavaScript a pass-by-reference or pass-by-value language?
...ause a is a memory location passed by value that references a string (char array). Passing structs (similar to js objects) by value in C is allowed, but not recommended. JavaScript simply enforces these best practices and hides the unnecessary and usually undesired cruft... and it sure makes for ...
Performance of static methods vs instance methods
...pact here would be how close data is to related data (value-type fields or array values are closer than data in reference type fields) and patterns of access.
– Jon Hanna
Jun 23 '15 at 19:18
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How to count the number of set bits in a 32-bit integer?
...ic optimizations.
With full SIMD for wider vectors (e.g. counting a whole array)
This bitwise-SWAR algorithm could parallelize to be done in multiple vector elements at once, instead of in a single integer register, for a speedup on CPUs with SIMD but no usable popcount instruction. (e.g. x86-64 c...
OO Design in Rails: Where to put stuff
...fig.rb
/config/initializer/core_ext/string.rb
/config/initializer/core_ext/array.rb
For reusable code fragments, I often create (micro)plugins so that I can reuse them in other projects.
Helper files usually holds helper methods and sometimes classes when the object is intended to be used by help...