export const TREE_ROOT_ID = '';
-export interface TreeNode<T> {
+export interface TreeNode<T = any> {
children: string[];
value: T;
id: string;
const [newTree] = [tree]
.map(tree => getNode(node.id)(tree) === node
? tree
- : Object.assign({}, tree, { [node.id]: node }))
+ : { ...tree, [node.id]: node })
.map(addChild(node.parent, node.id));
return newTree;
};
};
export const mapTreeValues = <T, R>(mapFn: (value: T) => R) => (tree: Tree<T>): Tree<R> =>
- getNodeDescendants('')(tree)
+ getNodeDescendantsIds('')(tree)
.map(id => getNode(id)(tree))
.map(mapNodeValue(mapFn))
.reduce((newTree, node) => setNode(node)(newTree), createTree<R>());
-export const mapTree = <T, R>(mapFn: (node: TreeNode<T>) => TreeNode<R>) => (tree: Tree<T>): Tree<R> =>
- getNodeDescendants('')(tree)
+export const mapTree = <T, R = T>(mapFn: (node: TreeNode<T>) => TreeNode<R>) => (tree: Tree<T>): Tree<R> =>
+ getNodeDescendantsIds('')(tree)
.map(id => getNode(id)(tree))
.map(mapFn)
.reduce((newTree, node) => setNode(node)(newTree), createTree<R>());
-export const getNodeAncestors = (id: string) => <T>(tree: Tree<T>): string[] => {
+export const getNodeAncestors = (id: string) => <T>(tree: Tree<T>) =>
+ mapIdsToNodes(getNodeAncestorsIds(id)(tree))(tree);
+
+
+export const getNodeAncestorsIds = (id: string) => <T>(tree: Tree<T>): string[] => {
const node = getNode(id)(tree);
return node && node.parent
- ? [...getNodeAncestors(node.parent)(tree), node.parent]
+ ? [...getNodeAncestorsIds(node.parent)(tree), node.parent]
: [];
};
-export const getNodeDescendants = (id: string, limit = Infinity) => <T>(tree: Tree<T>): string[] => {
+export const getNodeDescendants = (id: string, limit = Infinity) => <T>(tree: Tree<T>) =>
+ mapIdsToNodes(getNodeDescendantsIds(id, limit)(tree))(tree);
+
+export const getNodeDescendantsIds = (id: string, limit = Infinity) => <T>(tree: Tree<T>): string[] => {
const node = getNode(id)(tree);
const children = node ? node.children :
id === TREE_ROOT_ID
.concat(limit < 1
? []
: children
- .map(id => getNodeDescendants(id, limit - 1)(tree))
+ .map(id => getNodeDescendantsIds(id, limit - 1)(tree))
.reduce((nodes, nodeChildren) => [...nodes, ...nodeChildren], []));
};
-export const getNodeChildren = (id: string) => <T>(tree: Tree<T>): string[] =>
- getNodeDescendants(id, 0)(tree);
+export const getNodeChildren = (id: string) => <T>(tree: Tree<T>) =>
+ mapIdsToNodes(getNodeChildrenIds(id)(tree))(tree);
+
+export const getNodeChildrenIds = (id: string) => <T>(tree: Tree<T>): string[] =>
+ getNodeDescendantsIds(id, 0)(tree);
+
+export const mapIdsToNodes = (ids: string[]) => <T>(tree: Tree<T>) =>
+ ids.map(id => getNode(id)(tree)).filter((node): node is TreeNode<T> => node !== undefined);
const mapNodeValue = <T, R>(mapFn: (value: T) => R) => (node: TreeNode<T>): TreeNode<R> =>
({ ...node, value: mapFn(node.value) });