Overview

Miso.Data.Array is a Haskell wrapper around the JavaScript Array object. Values of type Array a live in JavaScript memory; all operations run in IO and mutate the underlying JS array in place.

Use this module when you need to pass a JS-native array to a browser API or a third-party JavaScript library. For pure Haskell data processing, prefer ordinary lists or Map.

Import qualified to avoid clashing with Prelude:

import qualified Miso.Data.Array as A

Quick start

import qualified Miso.Data.Array as A

example :: IO ()
example = do
  arr <- A.fromList [10, 20, 30 :: Int]
  A.push 40 arr
  v   <- A.lookup 2 arr    -- Just 30
  n   <- A.size arr        -- 4
  xs  <- A.toList arr      -- [10, 20, 30, 40]
  pure ()

Operations

• Construction: new, fromList, singleton
• Deconstruction: toList
• Access: lookup, (!?), member, size, null
• Mutation: insert, push, pop, shift, unshift, splice, reverse

See also

• Miso.Data.Map — mutable JS Map
• Miso.Data.Set — mutable JS Set
• Miso.DSL — ToJSVal / FromJSVal used by element types