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Fastest way to flatten / un-flatten nested JSON objects

I threw some code together to flatten and un-flatten complex/nested JSON objects. It works, but it's a bit slow (triggers the 'long script' warning). ...
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combinations between two lists?

It’s been a while and I’m having trouble wrapping my head around a algorithm I’m try to make. Basically, I have two lists and want to get all the combinations of the two lists. ...
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How to sort strings in JavaScript

I have a list of objects I wish to sort based on a field attr of type string. I tried using - 11 Answers ...
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How to select rows from a DataFrame based on column values?

How to select rows from a DataFrame based on values in some column in Pandas? 10 Answers ...
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SQL WHERE.. IN clause multiple columns

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Understanding the map function

Apply function to every item of iterable and return a list of the results. If additional iterable arguments are passed, function must take that many arguments and is applied to the items from all iterables in parallel. ...
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Fastest hash for non-cryptographic uses?

I'm essentially preparing phrases to be put into the database, they may be malformed so I want to store a short hash of them instead (I will be simply comparing if they exist or not, so hash is ideal). ...
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What is the most efficient way to create a dictionary of two pandas Dataframe columns?

What is the most efficient way to organise the following pandas Dataframe: 4 Answers 4...
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Why do we need virtual functions in C++?

I'm learning C++ and I'm just getting into virtual functions. 26 Answers 26 ...
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A monad is just a monoid in the category of endofunctors, what's the problem?

Who first said the following? 5 Answers 5 ...