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Does MongoDB's $in clause guarantee order
...your 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 "wei...
Where do the Python unit tests go?
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Cristian Ciupitu
17.3k77 gold badges4646 silver badges6868 bronze badges
answered Sep 15 '08 at 12:52
user6868user6868
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What is the best way to call a script from another script?
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47
What if test1.py is located in some far-away directory?
– Evgeni Sergeev
Jun 8 '14 at 5:46
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Why is early return slower than else?
...wer than with_else():
>>> T(lambda : without_else()).repeat()
[0.42015745017874906, 0.3188967452567226, 0.31984281521812363]
>>> T(lambda : with_else()).repeat()
[0.36009842032996175, 0.28962249392031936, 0.2927151355828528]
>>> T(lambda : without_else(True)).repeat()
[0....
fs: how do I locate a parent folder?
...|
edited Jul 26 '16 at 20:45
Clint
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answered Aug 16 '11 at 18:2...
How to make a class JSON serializable
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mkrieger1
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answered Sep 22 '10 at 12:02
Manoj GovindanManoj ...
Store JSON object in data attribute in HTML jQuery
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nathan gonzaleznathan gonzalez
10.8k44 gold badges3737 silver badges5656 bronze badges
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From an array of objects, extract value of a property as array
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1524
Here is a shorter way of achieving it:
let result = objArray.map(a => a.foo);
OR
let resu...
How to find out what type of a Mat object is with Mat::type() in OpenCV
... CV_32S: r = "32S"; break;
case CV_32F: r = "32F"; break;
case CV_64F: r = "64F"; break;
default: r = "User"; break;
}
r += "C";
r += (chans+'0');
return r;
}
If M is a var of type Mat you can call it like so:
string ty = type2str( M.type() );
printf("Matrix: %s %dx%d \...