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require("@babel/polyfill");
const {
Fn,
IntSum,
Arr,
implement,
Functor,
Apply,
Chain,
Foldable,
Traversable
} = require("@masaeedu/fp");
const RoseTree_ = (() => {
// Constructors
const Node = l => c => ({ label: l, children: c });
// Traversable
const traverse = A => f => ({ label, children }) =>
A.lift2(Node)(f(label))(Arr.traverse(A)(traverse(A)(f))(children));
return { Node, traverse }
})()
// derive stuff
const derivations = Arr.map(implement)([Traversable, Foldable, Functor])
const RoseTree = Fn.pipe(derivations)(RoseTree_)
const intercalate = F => M => sep => {
let empty = true;
return F.foldl(m => x => M.append(m)(empty ? (empty = false, x) : M.append(sep)(x)))(M.empty)
}
const Str = { empty: "", append: x => y => x + y }
const { Node: N } = RoseTree;
intercalate(RoseTree)(Str)(", ")(
N("one")([
N("two")([
N("three")([])
]),
N("four")([])
])
)
// => "one, two, three, four"
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