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What's the $unwind operator in MongoDB?
... the following:
db.article.aggregate(
{ $project : {
author : 1 ,
title : 1 ,
tags : 1
}},
{ $unwind : "$tags" }
);
would return the following documents:
{
"result" : [
{
"_id" : ObjectId("4e6e4ef557b77501a49233f6"),
...
How to get a key in a JavaScript object by its value?
...ct).find(key => object[key] === value);
}
const map = {"first" : "1", "second" : "2"};
console.log(getKeyByValue(map,"2"));
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What's valid and what's not in a URI query?
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edited Aug 19 '14 at 17:31
yonran
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What is the fastest method for selecting descendant elements in jQuery?
...
Method 1 and method 2 are identical with the only difference is that method 1 needs to parse the scope passed and translate it to a call to $parent.find(".child").show();.
Method 4 and Method 5 both need to parse the selector and ...
Compare JavaScript Array of Objects to Get Min / Max
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16 Answers
16
Active
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Accessing dict keys like an attribute?
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313
The best way to do this is:
class AttrDict(dict):
def __init__(self, *args, **kwargs):
...
How to state in requirements.txt a direct github source
...nt to particular commit:
-e git://github.com/mozilla/elasticutils.git@000b14389171a9f0d7d713466b32bc649b0bed8e#egg=elasticutils
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[ :Unexpected operator in shell programming [duplicate]
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answered Aug 5 '10 at 1:08
WolphWolph
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For each row in an R dataframe
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105
You can try this, using apply() function
> d
name plate value1 value2
1 A P1 ...