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

Hi Martin, I think given that integers are converted to fromInteger x and that strings can be overloaded you could implement something like this with a state or a writer monad: mySet = do 1 2 3 4 5 6 To do this you'll need to implement the appropriate classes. But I guess it's more a hack towards getting what you want than to being true to what a monad is. On Mon, Jul 22, 2013 at 3:06 AM, Ozgur Akgun wrote:

Hi.

On 21 July 2013 17:23, martin 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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