Created
May 7, 2017 15:26
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takeWhileMap
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| { | |
| "version": "1.0.0", | |
| "summary": "provides takeWhileMap, function is executed only while it returns Just smth, first Nothing stops the execution", | |
| "repository": "https://github.com/user/project.git", | |
| "license": "BSD3", | |
| "source-directories": [ | |
| "." | |
| ], | |
| "exposed-modules": [], | |
| "dependencies": { | |
| "elm-lang/core": "5.1.1 <= v < 5.1.1", | |
| "elm-lang/html": "2.0.0 <= v < 2.0.0" | |
| }, | |
| "elm-version": "0.18.0 <= v < 0.19.0" | |
| } |
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| <html> | |
| <head> | |
| <style> | |
| html { | |
| background: #F7F7F7; | |
| color: red; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var app = Elm.Main.fullscreen() | |
| </script> | |
| </body> | |
| </html> |
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| module Main exposing (..) | |
| import Html exposing (Html, text) | |
| import List exposing (..) | |
| takeWhileMap : (a -> Maybe b) -> List a -> List b | |
| takeWhileMap f src = | |
| Tuple.second | |
| (List.foldl | |
| (\item acc -> | |
| case acc of | |
| ( True, res ) -> | |
| case (f item) of | |
| Just val -> ( True, res ++ [ val ] ) | |
| Nothing -> ( False, res ) | |
| ( False, res ) -> acc) | |
| ( True, [] ) | |
| src) | |
| main : Html a | |
| main = | |
| text | |
| (toString | |
| (takeWhileMap | |
| (\n -> if (n <= 3) then Just (n - 10) else Nothing) | |
| [ 2, 1, 0, 1, 3, 5, 1, 0, 2, 3 ]) | |
| ) |
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