ES6 gives an alternative way to assign variables. Can you guess what the below code does?

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#1

ES6 gives an alternative way to assign variables. Can you guess what the below code does?

let a = 12, b = 3;
[a, b] = [b, a];
Makes both a and b equal 12.
Swaps the values inside a and b, without using extra variables.
Creates an array that contains a and b.

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#2

Swaps the values inside a and b, without using extra variables.

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#3

Swaps the values inside a and b, without using extra variables.