Advent of Code 2020 Day 11

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This is a walkthrough of Day 11: Seating System, Advent of Code 2020, including a JavaScript implementation.

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Great explanation and walk through as always, Alvin. Thanks!

rdius
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is there any specific reason why didn't you copy array by just simply
```
let copyarr = [...arr];
```
I saw you use map in the vid

lupanama