Haskell-ghci, function toUpper not found?
I'have right now installed the ghci version 8.6.2 and following a tutorial I write:
toUpper "something"
but ghci compiler prints out:
Variable not in scope: toUpper :: [Char] -> t
Do I miss some libraries or anything else?
function haskell ghci toupper
asked Nov 12 '18 at 18:08
glc78
129114
add a comment |
I'have right now installed the ghci version 8.6.2 and following a tutorial I write:
toUpper "something"
but ghci compiler prints out:
Variable not in scope: toUpper :: [Char] -> t
Do I miss some libraries or anything else?
function haskell ghci toupper
asked Nov 12 '18 at 18:08
glc78
129114
add a comment |
I'have right now installed the ghci version 8.6.2 and following a tutorial I write:
toUpper "something"
but ghci compiler prints out:
Variable not in scope: toUpper :: [Char] -> t
Do I miss some libraries or anything else?
function haskell ghci toupper
asked Nov 12 '18 at 18:08
glc78
129114
I'have right now installed the ghci version 8.6.2 and following a tutorial I write:
toUpper "something"
but ghci compiler prints out:
Variable not in scope: toUpper :: [Char] -> t
Do I miss some libraries or anything else?
function haskell ghci toupper
function haskell ghci toupper
asked Nov 12 '18 at 18:08
glc78
129114
asked Nov 12 '18 at 18:08
glc78
129114
asked Nov 12 '18 at 18:08
glc78
129114
asked Nov 12 '18 at 18:08
glc78
129114
asked Nov 12 '18 at 18:08
glc78
129114
129114
add a comment |
add a comment |
1 Answer
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The toUpper :: Char -> Char is not part of the Prelude, and thus not imported "implicitly".
You can import it with:
import Data.Char(toUpper)or just:
import Data.Charto import all functions, datatypes, etc. defined in that module.
Note that it has signature Char -> Char, so it only converts a single character to its uppercase equivalent.
You thus need to perform a mapping:
Prelude Data.Char> map toUpper "something"
"SOMETHING"
answered Nov 12 '18 at 18:11
Willem Van Onsem
144k16136228
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The toUpper :: Char -> Char is not part of the Prelude, and thus not imported "implicitly".
You can import it with:
import Data.Char(toUpper)or just:
import Data.Charto import all functions, datatypes, etc. defined in that module.
Note that it has signature Char -> Char, so it only converts a single character to its uppercase equivalent.
You thus need to perform a mapping:
Prelude Data.Char> map toUpper "something"
"SOMETHING"
answered Nov 12 '18 at 18:11
Willem Van Onsem
144k16136228
add a comment |
The toUpper :: Char -> Char is not part of the Prelude, and thus not imported "implicitly".
You can import it with:
import Data.Char(toUpper)or just:
import Data.Charto import all functions, datatypes, etc. defined in that module.
Note that it has signature Char -> Char, so it only converts a single character to its uppercase equivalent.
You thus need to perform a mapping:
Prelude Data.Char> map toUpper "something"
"SOMETHING"
answered Nov 12 '18 at 18:11
Willem Van Onsem
144k16136228
add a comment |
The toUpper :: Char -> Char is not part of the Prelude, and thus not imported "implicitly".
You can import it with:
import Data.Char(toUpper)or just:
import Data.Charto import all functions, datatypes, etc. defined in that module.
Note that it has signature Char -> Char, so it only converts a single character to its uppercase equivalent.
You thus need to perform a mapping:
Prelude Data.Char> map toUpper "something"
"SOMETHING"
answered Nov 12 '18 at 18:11
Willem Van Onsem
144k16136228
The toUpper :: Char -> Char is not part of the Prelude, and thus not imported "implicitly".
You can import it with:
import Data.Char(toUpper)or just:
import Data.Charto import all functions, datatypes, etc. defined in that module.
Note that it has signature Char -> Char, so it only converts a single character to its uppercase equivalent.
You thus need to perform a mapping:
Prelude Data.Char> map toUpper "something"
"SOMETHING"
answered Nov 12 '18 at 18:11
Willem Van Onsem
144k16136228
answered Nov 12 '18 at 18:11
Willem Van Onsem
144k16136228
answered Nov 12 '18 at 18:11
Willem Van Onsem
144k16136228
answered Nov 12 '18 at 18:11
Willem Van Onsem
144k16136228
144k16136228
add a comment |
add a comment |
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