Haskell: Convert every character in string to uppercase

Following statement converts every character in string to uppercase.

getUpper list = [toUpper x | x <- list ]

Prelude> import Data.Char
Prelude Data.Char> 
Prelude Data.Char> let getUpper list = [toUpper x | x <- list ]
Prelude Data.Char> 
Prelude Data.Char> getUpper "Hello ptr, How are you"
"HELLO PTR, HOW ARE YOU"

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