Operation method collection for tree node(like operation array).

Usage

• Install

npm install --save operation-tree-node

API

• Base
  • treeEach: each tree nodes
  • treeFilter: filter tree nodes
  • treeMap: replace tree node
  • treeFind: find tree node
  • treeToFlatArray: to flat array
• Advance
  • treeSort: sort tree nodes
  • treeCheck: check tree nodes
  • treeEachParent: parent node each
  • treeFindParent: find node parent
  • treeMerge: merge same nodes
  • treeAppendParent: append parent link
  • treeAppendLevel: append tree node level
  • treeNodeLevel: get node level

common arguments:

name	type	description
data	object[]	example: [{ id: 1, name: "1", children: [{ id: 2, name: "2" }] }]
callback	(node, index, arr, parent) => boolean/object/void	node: tree node, index: parent children's index, arr: parent children, parent: parent node
props	{ id: string, children: string, parent: string }	tree node's 'children', 'parent' and 'id' key name

Base

treeEach

treeEach(data, callback, props) tree node each(like Array.prototype.forEach).

recursive will break until callback is false.

import { treeEach } from "operation-tree-node";

const treeData1 = [{ id: 1, name: "1", children: [{ id: 2, name: "2" }] }];

treeEach(treeData1, (node, index, arr, parent) => {
  console.log(node.name, index, arr, parent);
});
// '1', 0, [treeData], undefined
// '2', 0, [treeData[0].children], [treeData[0]]

// use children props
const treeData2 = [{ id: 1, name: "1", child: [{ id: 2, name: "2" }] }];
treeEach(treeData2, console.log, { children: "child" });

treeFilter

treeFilter(data, callback, props, isStrictly) tree node filter(like Array.prototype.filter).

get a new data instead of change source.

import { treeFilter } from "operation-tree-node";

const treeData = [
  { id: 1, name: "1", child: [{ id: 2, name: "2" }] },
  { id: 3, name: "3" },
];

const result = treeFilter(treeData, (node) => node.id === 2, {
  children: "child",
});
console.log(result);
// [{ id: 1, name: '1', child: [{ id: 2, name: '2' }] }]

treeMap

treeMap(data, callback, props) tree node map(like Array.prototype.map).

get a new data instead of change source.

import { treeMap } from "operation-tree-node";

const treeData = [{ id: 1, name: "1", children: [{ id: 2, name: "2" }] }];

// tree node's +1
const newData = treeMap(treeData, (node) => ({
  id: node.id + 1,
  name: node.name,
  ...(node.children ? { children: node.children } : {}),
}));
console.log(newData);
// [{ id: 2, name: '1', children: [{ id: 3, name: '2' }] }]

treeFind

treeFind(data, callback, props) tree node find(like Array.prototype.find).

recursive will break until found.

import { treeFind } from "operation-tree-node";

const treeData = [
  { id: 1, name: "1", children: [{ id: 2, name: "2" }] },
  { id: 1, name: "1", children: [{ id: 2, name: "2" }] },
];

const find = treeFind(treeData, (node) => node.id === 2);
console.log(find);
// { id: 2, name: '2' }

treeToFlatArray

treeToFlatArray(data, callback, props) tree to flat array.

get a flat array and source data structure is not change.

import { treeToFlatArray } from "operation-tree-node";

const treeData = [{ id: 1, name: "1", children: [{ id: 2, name: "2" }] }];

const result = treeToFlatArray(treeData);
console.log(result);
// [
//   { id: 1, name: '1', children: [{ id: 2, name: '2' }] },
//   { id: 2, name: '2' }
// ]

Advance

treeSort

treeSort(data, callback, props) tree node sort(like Array.prototype.sort).

get a new data instead of change source.

name	type	description
data	(same)	(same)
callback	(currentNode, nextNode) => number	currentNode/nextNode: tree node, compare with them
props	(same)	(same)

const treeData = [
  {
    id: 1,
    name: "1",
    children: [
      { id: 3, name: "3" },
      { id: 2, name: "2" },
    ],
  },
];

// 1,3,2 => 1,2,3
const newData = treeSort(
  treeData,
  (currentNode, nextNode) => currentNode.id - nextNode.id
);
console.log(newData);
// [
//   {
//     id: 1,
//     name: '1',
//     children: [{ id: 2, name: '2' }, { id: 3, name: '3' }]
//   }
// ]);

treeCheck

treeCheck(data, checkIds, props) tree node check.

get all associated node'id by check one node.

name	type	description
data	(same)	(same)
checkIds	number[]/string[]	will checked node ids
props	(same)	(same)

import { treeCheck } from "operation-tree-node";

const treeData = [{ id: 1, name: "123", children: [{ id: 2, name: "2" }] }];
const resultIds = treeCheck(treeData, [2], {
  id: "id",
  children: "children",
  parent: "parent",
});
console.log(resultIds);
// [2, 1]

treeEachParent

treeEachParent(data, callback, props) tree node each parent.

recursive will break until callback is false.

name	type	description
data	(same)	(same)
callback	(parent) => void/boolean	parent: parent node, if callback false, skip parent.parent
props	(same)	(same)

import { treeEachParent } from "operation-tree-node";

const treeData = [
  { id: 1, name: "123", children: [{ id: 2, name: "2", parent: null }] },
];
treeData[0].children[0].parent = treeData[0];

const names = [];
treeEachParent(treeData[0].children, (parent) => !!names.push(parent.name));
console.log(names);
// ['123']

treeFindParent

treeFindParent(node, callback, props) tree node find parent.

import { treeFindParent } from "operation-tree-node";

const treeData = [
  {
    id: 1,
    name: "123",
    parent: null,
    children: [{ id: 2, name: "2", parent: null, children: [] }],
  },
];
treeData[0].children[0].parent = treeData[0];

const find = treeFindParent(treeData[0].children[0], (node) => node.id === 1);
console.log(find);
// { id: 1, name: '123', children: ... }

treeMerge

treeMerge（data, callback, props) tree node merge(same level).

get a new data instead of change source.

name	type	description
data	(same)	(same)
callback	(currentNode, nextNode) => boolean	currentNode/nextNode: tree node, compare with them
props	(same)	(same)

import { treeMerge } from "operation-tree-node";

const treeData = [
  { id: 1, name: "1", type: "1", children: [{ id: 2, name: "2" }] },
  { id: 3, name: "3", type: "1", children: [{ id: 4, name: "4" }] },
];

const result = treeMerge(
  treeData,
  (curr, next) => curr.type && curr.type === next.type
);
console.log(result);
// [
//   {
//     id: 1,
//     name: '1',
//     type: '1',
//     children: [{ id: 2, name: '2' }, { id: 4, name: '4' }]
//   }
// ]

treeAppendParent

treeAppendParent(data, props) append parent to each tree node.

the parent is a non-enumerable property, and the method will change the source.

import { treeAppendParent } from "operation-tree-node";

const treeData = [{ id: 1, name: "1", children: [{ id: 2, name: "2" }] }];

treeAppendParent(treeData);
console.log(treeData);
// [{ id: 1, name: '1', parent: null, children: [{ id: 2, name: '2', parent: {} }] }]

treeAppendLevel

treeAppendLevel(data, props) append level to each tree node.

the level is a non-enumerable property, and the method will change the source.

import { treeLevelParent } from "operation-tree-node";

const treeData = [{ id: 1, name: "1", children: [{ id: 2, name: "2" }] }];

treeAppendLevel(treeData);
console.log(treeData);
// [{ id: 1, name: '1', level: 0, children: [{ id: 2, name: '2', level: 1 }] }]

treeNodeLevel

treeNodeLevel(node, props) get tree node level.

the method needs parent link, and level start with 0.

import { treeAppendParent, treeNodeLevel } from "operation-tree-node";

const treeData = [{ id: 1, name: "1", children: [{ id: 2, name: "2" }] }];

// link parent
treeAppendParent(treeData);

const level = treeNodeLevel(treeData[0]); // 0
const level = treeNodeLevel(treeData[0].children[0]); // 1