问题
I'm looking for an idiomatic way to write a function List Char -> String in Purescript.
This seems like a simple thing to do, but I'm new to Purescript and have been browsing documentation for a while now with no progress!
Background information: I am porting a simple function from Haskell to Purescript
generateId :: Int -> [Char]
This generates a String of specified length. It was quite easy to convert the code to use List Char operations (where List is from Data.List in Purescript). In Haskell [Char] is the same as String so no other processing is needed, however, I can't find a function to convert from List Char to a native String in Purescript!
My search lead me to fromCharArray :: Array Char -> String in Data.String, however I could not find a way to convert from List Char to an Array Char!
I could manually convert between them by folding over List Char and building an Array Char using snoc, but surely I must be missing an inbuilt solution for what seems like basic String manipulation in Purescript!
Edit: fromList works to convert from any Unfoldable (such as Arrays) to a List. Still leaving this question open in case there is a more idiomatic way of achieving this.
回答1:
I agree with your edit. Data.String.fromCharArray <<< Data.List.fromList sounds pretty decent to me. fromCharArray is implemented in native JS with array.join("").
Update: fromList is deprecated now - use toUnfoldable instead
来源：https://stackoverflow.com/questions/34565039/how-do-i-convert-a-list-of-chars-to-a-string-in-purescript