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What are type lambdas in Scala and what are their benefits?
... point[A](a: A): M[A]
def bind[A, B](m: M[A])(f: A => M[B]): M[B]
}
Now, Either is a type constructor of two arguments, but to implement Monad, you need to give it a type constructor of one argument. The solution to this is to use a type lambda:
class EitherMonad[A] extends Monad[({type λ[...
Will #if RELEASE work like #if DEBUG does in C#?
...
Found this very useful as I have now defined a RELEASE constant for my Release configuration and a TESTING constant for my Testing configuration. Very useful for defining require https only for release #if (RELEASE) [RequireHttps] #endif
...
How would you make a comma-separated string from a list of strings?
...
Note if you are using python 2.7 (which you shouldn't by now) then using str will raise an exception if any item in the list has unicode.
– kroiz
May 26 at 13:54
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Git - How to close commit editor?
...description at the very top, press esc to exit insert mode, then type :x! (now the cursor is at the bottom) and hit enter to save and exit.
If typing :q! instead, will exit the editor without saving (and commit will be aborted)
...
Where does PHP's error log reside in XAMPP?
...side the vm (which took me an embarassingly long time to realise). I only know how to access via the xampp control panel terminal, with a path of: /opt/lampp/logs/php_error_log
– Scott Anderson
Apr 13 '19 at 14:16
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Crop MP3 to first 30 seconds
...his means ffmpeg -t 30 -i inputfile.mp3 -acodec copy outputfile.mp3 would now be the correct answer.
– Oben Sonne
Dec 30 '12 at 20:41
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How to find the array index with a value?
..."rollnumber": 3,
"name": "amit",
"subject": "chemistry"
},
];
Now if we have a requirement to select a particular object in the array. Let us assume that we want to find index of student with name Tanmay.
We can do that by iterating through the array and comparing value at the given ke...
Difference between CouchDB and Couchbase
... is still CouchDB, actively maintained and enhanced as an Apache project.
Now to the relevant differences:
Licensing
The Couchbase Server is not entirely open-source/free software. There are two versions: Community Edition (free but no latest bug fixes) and Enterprise Edition (there are restricti...
Imply bit with constant 1 or 0 in SQL Server
... To make the code more readable we standardised our SQL and now use declared bit variables when we need to express true/false.
– Damien McGivern
Feb 22 '11 at 15:54
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How to reverse a 'rails generate'
...stroy scaffold hohoho
Rails 3.2 adds a new d shortcut to the command, so now you can write:
rails d controller lalala
rails d model yadayada
rails d scaffold hohoho
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