[Haskell-beginners] Syntactic sugar to insert into a Map?

[Ozgur Akgun]

Hi.

On 21 July 2013 17:23, martin <martin.drautzburg at web.de> wrote:

> I just want to insert several key/value pairs, something like
>
> Map.empty
> insert key1 val1
> insert key2 val2
> return theMap
>

If you really want this syntax, what about using the writer monad:

import Control.Monad.Writer
import qualified Data.Map as M

m = execWriter $ do
    insert 1 "foo"
    insert 2 "bar"
    where insert k v = tell (M.singleton k v)
-- m = fromList [(1,"foo"),(2,"bar")]


Hope this helps,
Ozgur
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