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Include all existing fields and add new fields to document
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In 4.2+, you can use the $set aggregation pipeline operator which is nothing other than an alias to $addFieldsadded in 3.4
The $addFields stage is equivalent to a $project stage that explicitly specifies all existing fields i...
How to check if a string is a valid hex color representation?
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287
/^#[0-9A-F]{6}$/i.test('#AABBCC')
To elaborate:
^ -> match beginning
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Why do most fields (class members) in Android tutorial start with `m`?
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answered Aug 16 '11 at 2:09
xiaobing.zhaoxiaobing.zhao
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How to save all the variables in the current python session?
...option is to use the 'pickle' module. However, I don't want to do this for 2 reasons:
7 Answers
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How to efficiently build a tree from a flat structure?
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123
Store IDs of the objects in a hash table mapping to the specific object. Enumerate through all ...
Checking if a string array contains a value, and if so, getting its position
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12 Answers
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How to loop backwards in python? [duplicate]
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302
range() and xrange() take a third parameter that specifies a step. So you can do the following.
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Check if object is file-like in Python
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edited Aug 10 '10 at 20:34
answered Nov 2 '09 at 13:29
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How do I create a dictionary with keys from a list and values defaulting to (say) zero? [duplicate]
I have a = [1,2,3,4] and I want d = {1:0, 2:0, 3:0, 4:0}
5 Answers
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Delegates: Predicate vs. Action vs. Func
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answered Feb 19 '09 at 21:22
Jon SkeetJon Skeet
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