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Repeat String - Javascript
...ell as adding the second byte). The third byte requires a cost of 3 units, etc.
C(N) = 1 + 2 + 3 + ... + N = N(N+1)/2 = O(N^2). The symbol O(N^2) is pronounced Big O of N squared, and it means that the computational cost in the long run is proportional to the square of the string length. To create ...
What is the difference between trie and radix trie data structures?
...hose characteristics (such as depth, memory need, search miss/hit runtime, etc.) depend on radix of the underlying alphabets, we may call them radix “trie’s”. For example, an un-compacted as well as a compacted trie when uses alphabets a-z, we can call it a radix 26 trie. Any trie that uses on...
Why does Java switch on contiguous ints appear to run faster with added cases?
...e 86)
; {section_word}
[etc.]
0x0000000002524744: add rsp,0x10
0x0000000002524748: pop rbp
0x0000000002524749: test DWORD PTR [rip+0xfffffffffde1b8b1],eax # 0x0000000000340000
; ...
mmap() vs. reading blocks
... against memory, such as compiler auto-vectorization, SIMD intrinsics, prefetching, optimized in-memory parsing routines, OpenMP, etc.
In the case that the file is already in the cache, it seems impossible to beat: you just directly access the kernel page cache as memory and it can't get faster th...
When should I use Arrow functions in ECMAScript 6?
...type definitions live in the global scope (think String.prototype.truncate etc.) and those generally have to be of type function anyway. Consistently using function on the global scope helps avoid errors.
Many functions in the global scope are object constructors for old-style class definitions.
Fun...
For-each over an array in JavaScript
...d properties with numeric names: NodeList instances, the arguments object, etc. How do we loop through their contents?
Use any of the options above for arrays
At least some, and possibly most or even all, of the array approaches above frequently apply equally well to array-like objects:
Use forE...
Append an object to a list in R in amortized constant time, O(1)?
... up to about a kB per node for my applications. I hold on to large arrays, etc.
– Ana Nimbus
Feb 1 at 6:23
...
Fastest way to iterate over all the chars in a String
...t are done for string sizes in multiples of two starting with 0,1,2,4,8,16 etc.
The tests are done 1,000 times per string size
The tests are shuffled into random order each time. In other words, the tests are done in random order every time they are done, over 1000 times over.
The entire test sui...
What's so bad about Template Haskell?
...or only function declarations, or only data-constructor-matching patterns, etc.
You can generate expressions that don't compile. You generated an expression that references a free variable foo that doesn't exist? Tough luck, you'll only see that when actually using your code generator, and only unde...
A monad is just a monoid in the category of endofunctors, what's the problem?
...y (which also comes with the Platform):
newtype Compose f g a = Compose { getCompose :: f (g a) }
-- | The composition of two 'Functor's is also a 'Functor'.
instance (Functor f, Functor g) => Functor (Compose f g) where
fmap f (Compose fga) = Compose (fmap (fmap f) fga)
So the natural tran...