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What is “lifting” in Scala?
...ion.
scala> val pf: PartialFunction[Int, Boolean] = { case i if i > 0 => i % 2 == 0}
pf: PartialFunction[Int,Boolean] = <function1>
scala> pf.lift
res1: Int => Option[Boolean] = <function1>
scala> res1(-1)
res2: Option[Boolean] = None
scala> res1(1)
res3: Option[...
Git pull from another repository
...t.
– Frankie Simon
Mar 9 '15 at 13:20
4
Since git 2.9, you will need to specify the --allow-unrel...
How to count items in a Go map?
...ed from the now-retired SO documentation:
m := map[string]int{}
len(m) // 0
m["foo"] = 1
len(m) // 1
If a variable points to a nil map, then len returns 0.
var m map[string]int
len(m) // 0
Excerpted from Maps - Counting map elements. The original author was Simone Carletti. Attribution det...
When is memoization automatic in GHC Haskell?
...situations. For example, consider the function
f = \x -> let y = [1..30000000] in foldl' (+) 0 (y ++ [x])
GHC might notice that y does not depend on x and rewrite the function to
f = let y = [1..30000000] in \x -> foldl' (+) 0 (y ++ [x])
In this case, the new version is much less effici...
How to create loading dialogs in Android?
... |
edited Mar 26 '10 at 18:30
answered Mar 26 '10 at 18:22
...
what is faster: in_array or isset? [closed]
...t-in function.
These can be demonstrated by using an array with values (10,000 in the test below), forcing in_array to do more searching.
isset: 0.009623
in_array: 1.738441
This builds on Jason's benchmark by filling in some random values and occasionally finding a value that exists in the a...
error: Libtool library used but 'LIBTOOL' is undefined
...
|
edited Mar 10 at 21:02
S.S. Anne
13.1k66 gold badges2727 silver badges5959 bronze badges
a...
Printing all global variables/local variables?
...
Miles Rout
1,06511 gold badge1212 silver badges2525 bronze badges
answered Jun 7 '11 at 6:44
kennytmkennytm
...
Create a tag in a GitHub repository
...
1590
You can create tags for GitHub by either using:
the Git command line, or
GitHub's web interfac...
How can I add CGPoint objects to an NSArray the easy way?
I have about 50 CGPoint objects that describe something like a "path", and I want to add them to an NSArray. It's going to be a method that will just return the corresponding CGPoint for an given index. I don't want to create 50 variables like p1 = ...; p2 = ..., and so on. Is there an easy way that...