raine/gist:6d45b6c6b0fc825041e4 Secret

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1.md

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category-list-to-tree = (list) ->
    recurse-category = (c) ->
        label: c?.'name_en' or 'Categories'
        nodes: map recurse-category, filter do
            where-eq do
                level  : c and c.level + 1 or 0
                parent : c and c.id or void
            , list
    recurse-category null

vs.

is-child-of = ->
    where-eq level: it.level + 1, parent: it.id

category-list-to-tree = (list) ->
    recurse-category = (c) ->
        label: c.'name_en'
        nodes: filter (is-child-of c), list |> map recurse-category

    filter (.level is 0), list
    |> map recurse-category