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What is “lifting” in Haskell?
...will now refute me by showing how lifts are a category or something).
Typically you have some data type with a parameter. Something like
data Foo a = Foo { ...stuff here ...}
Suppose you find that a lot of uses of Foo take numeric types (Int, Double etc) and you keep having to write code that u...
Specify an SSH key for git push for a given domain
...y git command, on any remote, with an alternative SSH key. The idea is basically to switch your SSH identity when running the git commands.
Advantages relative to the host alias approach in the other answer:
Will work with any git commands or aliases, even if you can't specify the remote explicit...
Data access object (DAO) in Java
I was going through a document and I came across a term called DAO . I found out that it is a Data Access Object. Can someone please explain me what this actually is?
...
When should I use Arrow functions in ECMAScript 6?
...to use the same thisObject as the root. If even a single standard function callback is mixed in with a bunch of arrow functions there's a chance the scope will become messed up.
Compactness: Arrow functions are easier to read and write. (This may seem opinionated so I will give a few examples furthe...
android on Text Change Listener
...ght come across this again someday.
I had a similar problem where I would call setText on a EditText and onTextChanged would be called when I didn't want it to. My first solution was to write some code after calling setText() to undo the damage done by the listener. But that wasn't very elegant.
Af...
How to list all methods for an object in Ruby?
...ationships defined in the User class are not in the results of the methods call.
Added Note that :has_many does not add methods directly. Instead, the ActiveRecord machinery uses the Ruby method_missing and responds_to techniques to handle method calls on the fly. As a result, the methods are not l...
Is Ruby pass by reference or by value?
...o a value of 'foo'?
str = 'foo'
str.object_id # => 2000
A: A label called str is created that points at the object 'foo', which for the state of this Ruby interpreter happens to be at memory location 2000.
Q2: What happens when you assign the existing variable str to a new object using =?...
ListView inside ScrollView is not scrolling on Android
...roid:nestedScrollingEnabled="true" to its XML declaration or by explicitly calling setNestedScrollingEnabled(true).
If you want to make nested scrolling work on pre-Lollipop devices, which you probably do, you have to use corresponding utility classes from the Support library. First you have to rep...
How to quit android application programmatically
I Found some codes for quit an Android application programatically. By calling any one of the following code in onDestroy() will it quit application entirely?
...
Preventing Laravel adding multiple records to a pivot table
...$item->id], false);
Update:
Since Laravel 5.3 or 5.2.44, you can also call syncWithoutDetaching:
$cart->items()->syncWithoutDetaching([$item->id]);
Which does exactly the same, but more readable :)
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