🌲🌿🌳 Nodes is a class protocol for tree data structures with multiple children. Written in Swift.

What's New

First Release! πŸŽ‰



Nodes is a class protocol for tree data structures. A class which conforms the Node-Protocol, will gain useful properties to easily navigate in the tree.


Create a new class and conform it to the Node-Protocol:

final class SimpleNode: Node {
    typealias Value = String
    var value: Value
    weak var parent: SimpleNode?
    var children: [SimpleNode]
    init(value: Value) {
        self.value = value
        self.children = []

extension SimpleNode: Equatable, CustomStringConvertible {
    static func == (lhs: SimpleNode, rhs: SimpleNode) -> Bool {
        return lhs.value == rhs.value && lhs.parent == rhs.parent

    public var description: String {
        return "\(value)"

Create a root node:

let root = SimpleNode(value: "Hand")

Add children with addChild(node: Node):

root.addChild(node: SimpleNode(value: "Thumb"))
root.addChild(node: SimpleNode(value: "Index finger"))
root.addChild(node: SimpleNode(value: "Middle finger"))
root.addChild(node: SimpleNode(value: "Ring finger"))
root.addChild(node: SimpleNode(value: "Little finger"))

Print tree to console:



β”œβ”€β”€ Thumb
β”œβ”€β”€ Index finger
β”œβ”€β”€ Middle finger
β”œβ”€β”€ Ring finger
└── Little finger



/// Returns all parent nodes.
var ancestors: [Node]
/// Returns all parent nodes, including the current node.
var ancestorsIncludingSelf: [Node]
/// A Boolean value indicating whether the current node is the top node.
var isRoot: Bool
/// Returns the top node.
var root: Node


/// Adds a sub-node.
func addChild(node: Node)
/// Returns the number of children.
var degree: Int
/// Returns all descendants, traversing the entire tree.
var descendants: [Node]


/// A Boolean value indicating whether the node is without children.
var isLeaf: Bool
/// Returns all nodes with no children.
var leaves: [Node]
/// Returns the number of leaves.
var breadth: Int


/// A Boolean value indicating whether the node has children.
var isBranch: Bool
/// Returns all nodes with at least one child.
var branches: [Node]


/// Returns all other nodes with the same parent.
var siblings: [Node]
/// Returns all nodes (including the current node) with the same parent.
var siblingsIncludingSelf: [Node]


/// Returns the distance between a node and the root.
var depth: Int
/// The number of edges between the current node and the root.
var level: Int

Textual representation

var lineBasedDescription: String


let root = SimpleNode(value: "Apple")

let desktops = SimpleNode(value: "Desktops")
root.addChild(node: desktops)

let macPro = SimpleNode(value: "Mac Pro")
desktops.addChild(node: macPro)

let macMini = SimpleNode(value: "Mac Mini")
desktops.addChild(node: macMini)

let iMac = SimpleNode(value: "iMac")
desktops.addChild(node: iMac)

let notebooks = SimpleNode(value: "Notebooks")
root.addChild(node: notebooks)

let macBookPro = SimpleNode(value: "MacBook Pro")
notebooks.addChild(node: macBookPro)

let devices = SimpleNode(value: "Devices")
root.addChild(node: devices)

let handhelds = SimpleNode(value: "Handhelds")
devices.addChild(node: handhelds)

let ipod = SimpleNode(value: "iPod")
handhelds.addChild(node: ipod)

let iphone = SimpleNode(value: "iPhone")
handhelds.addChild(node: iphone)

let newton = SimpleNode(value: "Newton")
handhelds.addChild(node: newton)

let setTopBoxes = SimpleNode(value: "Set-top boxes")
devices.addChild(node: setTopBoxes)

let appleTV = SimpleNode(value: "Apple TV")
setTopBoxes.addChild(node: appleTV)



β”œβ”€β”€ Desktops
β”‚   β”œβ”€β”€ Mac Pro
β”‚   β”œβ”€β”€ Mac Mini
β”‚   └── iMac
β”œβ”€β”€ Notebooks
β”‚   └── MacBook Pro
└── Devices
    β”œβ”€β”€ Handhelds
    β”‚   β”œβ”€β”€ iPod
    β”‚   β”œβ”€β”€ iPhone
    β”‚   └── Newton
    └── Set-top boxes
        └── Apple TV

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Nodes is released under the MIT License.


  • Swift Tools 5.1.0
View More Packages from this Author


  • None
Last updated: Tue Nov 08 2022 01:38:41 GMT-0500 (GMT-05:00)