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What is the purpose of the reader monad?
... to get a monad:
instance Monad (Reader env) where
return x = Reader (\_ -> x)
(Reader f) >>= g = Reader $ \x -> runReader (g (f x)) x
which is not so scary. ask is really simple:
ask = Reader $ \x -> x
while local isn't so bad:
local f (Reader g) = Reader $ \x -> runR...
Handler vs AsyncTask vs Thread [closed]
...ies, this link will take you right into some thread examples: youtu.be/4Vue_KuXfCk?t=19m24s
– Aggressor
Aug 20 '15 at 21:33
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Possible to do a MySQL foreign key to one of two possible tables?
..., you can designate which target table is referenced.
CREATE TABLE popular_places (
user_id INT NOT NULL,
place_id INT NOT NULL,
place_type VARCHAR(10) -- either 'states' or 'countries'
-- foreign key is not possible
);
There's no way to model Polymorphic Associations using SQL constraint...
RESTfully design /login or /register resources?
...a GET request for logging out.
(from http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol#Safe_methods)
Some methods (for example, HEAD, GET, OPTIONS and TRACE) are defined as safe, which means they are intended only for information retrieval and should not change the state of the server. In ot...
Form inside a form, is that alright? [duplicate]
...t" name="foo" form="saveForm" />
<input type="hidden" value="some_id" form="deleteForm" />
<input type="text" name="foo2" id="foo2" form="saveForm" value="success" />
<input type="submit" name="save" value="Save" form="saveForm" onclick="alert(document.getElementById('...
Is VB really case insensitive?
...ctice in fully case-sensitive languages.
– ingredient_15939
Oct 10 '13 at 18:52
...
Testing Private method using mockito
...But the title is testing the private methods
– diyoda_
Jun 6 '17 at 21:57
I have used Powermock to mock the private me...
Convert HTML to NSAttributedString in iOS
...ttribute: NSNumber(unsignedInteger:NSUTF8StringEncoding)]
dispatch_async(dispatch_get_main_queue()) {
if let attributedString = try? NSAttributedString(data: data, options: options, documentAttributes: nil) {
completionBlock(attributedString)
} else {...
git add, commit and push commands in one?
... to pass it an argument. I have added the following to my .bashrc (or .bash_profile if Mac):
function lazygit() {
git add .
git commit -a -m "$1"
git push
}
This allows you to provide a commit message, such as
lazygit "My commit msg"
You could of course beef this up even more by a...
Any reason why scala does not explicitly support dependent types?
...
@ashy_32bit if you can get access to "Advanced Topics in Types and Programming Languages" by Benjamin Pierce, there is a chapter in that which gives a reasonable introduction to dependent types. You could also read some papers by ...