Data-structures Questions

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Array data structure in nodejs

I'm working on a nodejs project where i need to restructure an array of objects. below is the sample out put i get from database,
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Undo redo for a huge object

I have a requirement where the product needs to implement undo-redo functionality. currently i hold a huge object which comes from a
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Output form ArrayMap equals to null

I'm writing a parser to print a file json on my mobile. i include an arraymap to save data received from the file. my problem is that when i have

CSV to Python Dictionary

For homework we have been asked to build a dictionary from csv (without importing csv or any other lib, only using built in python functions).
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Is Time complexity O(n) or O(n^2)?

I feel that the time complexity of this js function i wrote is o(n) but at the same time it feels like its o(n^2). what's the correct time

inserting a node at tail python

I'm trying to insert a node at the tail but my list keeps just saving the last value if i try to insert 1,5,7 at the head and 9 at tail..i
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