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What is “lifting” in Haskell?
...ive
instance Applicative Foo where
pure x = Foo $ ... -- Wrap 'x' inside a Foo.
(<*>) = liftFoo2 ($)
The (<*>) operator for Foo has the type
(<*>) :: Foo (a -> b) -> Foo a -> Foo b
It applies the wrapped function to the wrapped value. So if you can implement ...
Disabling implicit animations in -[CALayer setNeedsDisplayInRect:]
...eedsDisplayInRect: to update just the changed parts. This is working splendidly. However, when the graphics system updates my layer, it's transitioning from the old to the new image using a cross-fade. I'd like it to switch over instantly.
...
HTML/Javascript change div content
..., you can just use the element's innerHTML property.
document.getElementById("content").innerHTML = "whatever";
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How to iterate over a JSONObject?
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I will avoid iterator as they can add/remove object during iteration, also for clean code use for loop. it will be simply clean & fewer lines.
Using Java 8 and Lamda [Update 4/2/2019]
import org.json.JSONObject;
public static v...
How do you print in a Go test using the “testing” package?
...ttp://golang.org/pkg/testing/#pkg-index
fmt.X print statements do work inside tests, but you will find their output is probably not on screen where you expect to find it and, hence, why you should use the logging methods in testing.
If, as in your case, you want to see the logs for tests that are ...
Singular or plural controller and helper names in Rails
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still has singular CreditCard here: guides.rubyonrails.org/command_line.html#rails-generate
– rcrogers
Mar 5 '14 at 19:27
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How to avoid having class data shared among instances?
... def __init__(self):
self.list = []
Declaring the variables inside the class declaration makes them "class" members and not instance members. Declaring them inside the __init__ method makes sure that a new instance of the members is created alongside every new instance of the object, whi...
Preview layout with merge root tag in Intellij IDEA/Android Studio
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There is a new parentTag tools attribute (added in Android Studio 2.2) that you can use to specify the layout type for a merge tag, which will make the layout render correctly in the layout editor preview.
So using your example:
<merge xmlns:android="http://schemas.android.c...
What are these attributes: `aria-labelledby` and `aria-hidden`
...ributes are called as ARIA attribute states and model
aria-labelledby: Identifies the element (or elements) that labels the current element.
aria-hidden (state): Indicates that the element and all of its descendants are not visible or perceivable to any user as implemented
by the author....
Deleting a Google App Engine application
...ine SDK 1.2.6 it's possible to delete apps completely. But beware, the app-id won't be usable again.
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