When duplicating an array and using sort(), why do both arrays get sorted?

I am making a tournament bracket generator. Currently, I am working on the logic for this program in JavaScript. So far, I have separate arrays for different team classifications –

I have this array of pairs in JS :

I’m trying to sort an array of 6 integers in descending order(javascript) but keep matching values in their place as the other values are sorted. An example is posted below to help explain this problem:

I already searched and could not find the answer.

I have an array of objects. I want to move a selected object to the last position in the array. How do I do this in javascript or jquery?

I have an array of objects. I want to move a selected object to the last position in the array. How do I do this in javascript or jquery?

I recently had a training task:
given the array of {"color":string,"size":int} Objects, print them sorted by size. If multiple objects share same size, they,among themselves, should be sorted by color alphabetically.

I have a huge array of objects called steamData that look like this:

I have a huge array of objects called steamData that look like this: