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How do I perform the SQL Join equivalent in MongoDB?
... Orlando BecerraOrlando Becerra
1,50711 gold badge88 silver badges33 bronze badges
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How does the extend() function work in jQuery?
...r deep and false for light.
For example:
jQuery.extend(false, {'a' : {'a1': 1}}, {'a': {'a2': 2}})
the result will be:
{'a': {'a2': 2}} because this is light copy just compare level 1.
jQuery.extend(true, {'a' : {'a1': 1}}, {'a': {'a2': 2}})
the result will be:
{'a': {'a1': 1, 'a2': 2}} T...
In pure functional languages, is there an algorithm to get the inverse function?
...i) = (Bi i a)
composeBi :: Bi a b -> Bi b c -> Bi a c
composeBi (Bi a1 i1) (Bi a2 i2) = Bi (a2 . a1) (i1 . i2)
mapBi :: Bi a b -> Bi [a] [b]
mapBi (Bi a i) = Bi (map a) (map i)
bruteForceBi :: Eq b => [a] -> (a -> b) -> Bi a b
bruteForceBi domain f = Bi f (inv domain f)
I t...
LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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How to determine if one array contains all elements of another array
... This the the way to go. It might just be a bit shortened to (a2-a1).empty?
– Holger Just
Sep 12 '11 at 12:43
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Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
...n. This can be done with Paul Murrell's package compare:
library(compare)
a1 <- data.frame(a = 1:5, b = letters[1:5])
a2 <- data.frame(a = 1:3, b = letters[1:3])
comparison <- compare(a1,a2,allowAll=TRUE)
comparison$tM
# a b
#1 1 a
#2 2 b
#3 3 c
The function compare gives you a lot of f...
Using fonts with Rails asset pipeline
... Nathan ColgateNathan Colgate
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Applicatives compose, monads don't
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If you have applicatives A1 and A2, then the type data A3 a = A3 (A1 (A2 a)) is also applicative (you can write such an instance in a generic way).
On the other hand, if you have monads M1 and M2 then the type data M3 a = M3 (M1 (M2 a)) is not neces...
Get Character value from KeyCode in JavaScript… then trim
...83]
"T", // [84]
"U", // [85]
"V", // [86]
"W", // [87]
"X", // [88]
"Y", // [89]
"Z", // [90]
"OS_KEY", // [91] Windows Key (Windows) or Command Key (Mac)
"", // [92]
"CONTEXT_MENU", // [93]
"", // [94]
"SLEEP", // [95]
"NUMPAD0", // [96]
"NUMPAD1", // [97]
"NUMPAD2", ...
Recompile Heroku slug without push or config change
...
Weston Wedding
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answered Sep 4 '12 at 19:04
Brad KochBrad Koch
15.2k1717 gold...