Re: [Haskell-cafe] What is the meaning of tilde ("~") symbol

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Finally, it is the array subscript operator:

let x = arr ! 10

Shouldn't this be

let x = arr !! 10

!! is the list subscript. Look in Data.Array.IArray for (!). Or Data.Map. There's still no consensus on typeclasses for collections, so these are all separate functions. Has anyone taken a shot at a set of AT-using classes for the standard collections?