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Why are side-effects modeled as monads in Haskell?
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Suppose a function has side effects. If we take all the effects it produces as the input and output parameters, then the function is pure to the outside world.
So, for an impure function
f' :: Int -> Int
we add the RealWorld to the consideration
f :: Int -> RealWorld -> (Int, Re...
When would you use a WeakHashMap or a WeakReference?
...When have you needed to use a WeakHashMap or WeakReference and how was it used?
10 Answers
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How to change font of UIButton with Swift
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Use titleLabel instead. The font property is deprecated in iOS 3.0. It also does not work in Objective-C. titleLabel is label used for showing title on UIButton.
myButton.titleLabel?.font = UIFont(name: YourfontName, size: 20)
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Ignore with CSS?
I'm working on a site which has line breaks inserted as <br> in some of the headings. Assuming I can't edit the source HTML, is there a way with CSS I can ignore these breaks?
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Actual examples for HATEOAS (REST-architecture) [closed]
...ake/rudimentary REST-APIs in the wild (which implement a HTTP-API and call it REST without following the hypertext-as-the-engine-of-application-state requirement, which led to the famous rant of Roy T. Fielding , the man who first specified the REST-paradigm).
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c# open a new form then close the current form?
...es not work. When calling this.Close(), current form is disposed together with form2. Therefore you need to hide it and set form2.Closed event to call this.Close().
private void OnButton1Click(object sender, EventArgs e)
{
this.Hide();
var form2 = new Form2();
form2.Closed += (s, args) ...
Use PHP composer to clone git repo
I'm trying to use composer to automatically clone a git repository from github that isn't in packagist but it's not working and I can't figure out what am I doing wrong.
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Upgrade python in a virtualenv
...l need to see your virtualenv version).
If your virtualenv is installed with the same python version of the old one and upgrading your virtualenv package is not an option, you may want to read this in order to install a virtualenv with the python version you want.
EDIT
I've tested this approach ...
Scala 2.8 breakOut
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The answer is found on the definition of map:
def map[B, That](f : (A) => B)(implicit bf : CanBuildFrom[Repr, B, That]) : That
Note that it has two parameters. The first is your function and the second is an implicit. If you do not provide that impli...
Getting a slice of keys from a map
...ge mymap {
keys = append(keys, k)
}
}
To be efficient in Go, it's important to minimize memory allocations.
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