Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.
You've got two main options:
import Control.Monad (ap, forM_) | |
import qualified Data.Map as M | |
-- The Collapse Monad | |
-- ------------------ | |
-- The Collapse Monad allows collapsing a value with labelled superpositions | |
-- into a flat list of superposition-free values. It is like the List Monad, | |
-- except that, instead of always doing a cartesian product, it will perform | |
-- pairwise merges of distant parts of your program that are "entangled" | |
-- under the same label. Examples: |
En el diseño de bases de datos existen propiedades indeseables que no deberían presentarse en los esquemas. Éstas son:
L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns
Compress 1K bytes with Zippy ............. 3,000 ns = 3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns = 20 µs
SSD random read ........................ 150,000 ns = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs