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Understanding dict.copy() - shallow or deep?
... the content of the dictionary is not copied by value, but just creating a new reference.
>>> a = {1: [1,2,3]}
>>> b = a.copy()
>>> a, b
({1: [1, 2, 3]}, {1: [1, 2, 3]})
>>> a[1].append(4)
>>> a, b
({1: [1, 2, 3, 4]}, {1: [1, 2, 3, 4]})
In contrast, a ...
What is the purpose of the reader monad?
...rms (actually it will be closures because we want to do static scoping).
newtype Env = Env ([(String, Closure)])
type Closure = (Term, Env)
When we are done, we should get out a value (or an error):
data Value = Lam String Closure | Failure String
So, let's write the interpreter:
interp' :...
Nesting await in Parallel.ForEach
...etwork, you can Post() each id to the TransformBlock.
In code:
var ids = new List<string> { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10" };
var getCustomerBlock = new TransformBlock<string, Customer>(
async i =>
{
ICustomerRepo repo = new CustomerRepo();
...
Do NSUserDefaults persist through an Update to an app in the Appstore?
...l my testing on the iPhone device (and Apples testing) tested the app as a new install. Without any documentation or way to test as an update I was unable to repeat the update crash all our customers are now experiencing. To sum up - probably a lesson learned the hard way!!
– N...
Convert timestamp to readable date/time PHP
...
$timestamp = 1465298940;
$datetimeFormat = 'Y-m-d H:i:s';
$date = new \DateTime();
// If you must have use time zones
// $date = new \DateTime('now', new \DateTimeZone('Europe/Helsinki'));
$date->setTimestamp($timestamp);
echo $date->format($datetimeFormat);
result: 2016-06-07 14...
Simulate low network connectivity for Android [closed]
... For simulating latency over HTTP, use ResponseCache.setDefault(new CacheResponse(){...}) and put a Thread.sleep(200) call in there. This has the advantage of being programatically controlled (i.e. only just in one activity) and not affecting other processes. However, for a more realistic...
External VS2013 build error “error MSB4019: The imported project was not found”
...
OLD, VS2012
C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
NEW, VS2013
C:\Program Files (x86)\MSBuild\12.0\bin\msbuild.exe
Newer, VS2015
C:\Program Files (x86)\MSBuild\14.0\Bin\msbuild.exe
Newer still, VS2017 (not fully testing but discovered - they've moved things around a bit...
How do I do an OR filter in a Django query?
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled...
JavaScript pattern for multiple constructors
...omComponents = function(foo, bar) {
var foobar = foo + bar;
return new this(foobar);
};
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Finding all cycles in a directed graph
...lues to keep track of whether you visited a node before. If you run out of new nodes to go to (without hitting a node you have already been), then just backtrack and try a different branch.
The DFS is easy to implement if you have an adjacency list to represent the graph. For example adj[A] = {B,C}...