How to compare two lists in Haskell?

Question

In Haskell, how can you compare two lists to check if they are equal? Also the order shouldn't matter.

Example:

[1,2] = [2,1]

I tried all (flip elem [1,2,3]) [2,1], but this returns true...

Thanks.

Answer 1

Something like this?

import Data.List (sort)
areEqual a b = sort a == sort b

OUTPUT:
*Main> areEqual [1,2] [2,1]
True