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Cmd.map
Learn Cmd.map in Elm with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
12 min read
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Intermediate
Cmd.map is an atomic Elm topic inside Elm Architecture. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what Cmd.map changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.
Topic-specific example
elm-06-07-cmd-map.elm
elm
Try It Live
wrapped = Cmd.map ChildMsg childCmd
Edge case / engineering note
Check the input collection shape, whether the operation mutates or returns a new value, and what happens for an empty collection.
Content source & attribution
Original Syntaxis Content · Original Syntaxis Content