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Does MongoDB's $in clause guarantee order
...r documents with an array that is going to be passed in to the $in as [ 4, 2, 8 ].
Approach using Aggregate
var list = [ 4, 2, 8 ];
db.collection.aggregate([
// Match the selected documents by "_id"
{ "$match": {
"_id": { "$in": [ 4, 2, 8 ] },
},
// Project a "weight...
How do I break out of a loop in Scala?
...= 0
while (i <= 1000 && sum <= 1000) { sum += 1; i += 1 }
(2) Throw an exception.
object AllDone extends Exception { }
var sum = 0
try {
for (i <- 0 to 1000) { sum += i; if (sum>=1000) throw AllDone }
} catch {
case AllDone =>
}
(2a) In Scala 2.8+ this is already pre-...
Java: is there a map function?
...DK as of java 6.
Guava has a Function interface though and the
Collections2.transform(Collection<E>, Function<E,E2>)
method provides the functionality you require.
Example:
// example, converts a collection of integers to their
// hexadecimal string representations
final Collection<...
Does Java support default parameter values?
...
24 Answers
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How do I create a variable number of variables?
...ionaries are stores of keys and values.
>>> dct = {'x': 1, 'y': 2, 'z': 3}
>>> dct
{'y': 2, 'x': 1, 'z': 3}
>>> dct["y"]
2
You can use variable key names to achieve the effect of variable variables without the security risk.
>>> x = "spam"
>>> z = {x...
Javascript - sort array based on another array
...
21 Answers
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Error: “The sandbox is not in sync with the Podfile.lock…” after installing RestKit with cocoapods
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How do I split a string with multiple separators in javascript?
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22 Answers
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Use of .apply() with 'new' operator. Is this possible?
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