How does js encapsulate data reasonably?

problem description: the front interface is a table. Clicking on the cell will return the custom data data on the cell and the corresponding cell line number.
is as follows:
Line number: 0Jing 2Jue 1
data:a,xy,xyz

requirements:
how to effectively encapsulate data? (deduplicated data remains unique) for example: 

0 a,d,g,b,j
1 xd,ef,tg,sd
Array object front-end javascript
Apr.25,2021

tables are suitable for data in two-dimensional array format, like this: 

 

 I don't quite understand what you mean by this effective encapsulation. 


 what you want to ask is how to remove the weight of the array?

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