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Scala type programming resources
...ample (taken from metascala and apocalisp):
sealed trait Nat
sealed trait _0 extends Nat
sealed trait Succ[N <: Nat] extends Nat
Here you have a peano encoding of the natural numbers. That is, you have a type for each non-negative integer: a special type for 0, namely _0; and each integer grea...
Understanding __get__ and __set__ and Python descriptors
... how Python's property type is implemented. A descriptor simply implements __get__, __set__, etc. and is then added to another class in its definition (as you did above with the Temperature class). For example:
temp=Temperature()
temp.celsius #calls celsius.__get__
Accessing the property you assi...
Calling closure assigned to object property directly
...sn't work on a StdClass.
Before PHP7, you'd have to implement the magic __call method to intercept the call and invoke the callback (which is not possible for StdClass of course, because you cannot add the __call method)
class Foo
{
public function __call($method, $args)
{
if(is_...
Is there a foreach loop in Go?
...
https://golang.org/ref/spec#For_range
A "for" statement with a "range" clause iterates through all entries
of an array, slice, string or map, or values received on a channel.
For each entry it assigns iteration values to corresponding iteration
v...
Correct use of Multimapping in Dapper
...ourth
------------------+-------------+-------------------+------------
col_1 col_2 col_3 | col_n col_m | col_A col_B col_C | col_9 col_8
------------------+-------------+-------------------+------------
Following is the dapper query that you will have to write.
Query<TFirst, TSecond, TThird, TF...
What is the combinatory logic equivalent of intuitionistic type theory?
... bracket abstraction.
tm :: Tm a -> Unty a
tm (Var a) = V a
tm (Lam _ b) = bra (tm b)
tm (f :$ a) = tm f :. tm a
tm (Pi a b) = C P :. tm a :. tm b
tm Set = C U
bra :: Unty (Su a) -> Unty a -- binds a variable, building a function
bra (V Ze) = C S :. C K :. C...
How can I use threading in Python?
....dummy import Pool as ThreadPool
pool = ThreadPool(4)
results = pool.map(my_function, my_array)
Which is the multithreaded version of:
results = []
for item in my_array:
results.append(my_function(item))
Description
Map is a cool little function, and the key to easily injecting parallelism i...
Threading pool similar to the multiprocessing Pool?
...urrent.futures.ThreadPoolExecutor, i.e.:
executor = ThreadPoolExecutor(max_workers=10)
a = executor.submit(my_function)
See the docs for more info and examples.
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What's the difference between a Python module and a Python package?
...le (or files) that are imported under one import and used.
e.g.
import my_module
A package is a collection of modules in directories that give a package hierarchy.
from my_package.timing.danger.internets import function_of_love
Documentation for modules
Introduction to packages
...
Java “lambda expressions not supported at this language level”
...: android { compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } }
– BaDo
Sep 25 '15 at 2:30
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