node-relation

This module helps you manage string, numbers, object as a group. Check the code.

import { Relationship } from 'node-relation'

const A = new Relationship().to('a', 'b', 'c')
console.log(A.nodes) // ['a', 'b', 'c']

const B = A.to('b', 'd')
console.log(B.nodes) // ['a', 'b', 'c', 'd']

const C = B.to('e', 'f')
console.log(C.from('e').nodes) // ['e', 'f']

const D = C.to('e', 'a')
console.log(D.from('e').nodes) // ['a', 'b', 'c', 'd', 'e', 'f']

Install

You can download in npm node-relation.

npm install node-relation

How to use

Browser (umd)

<script src="https://cdn.jsdelivr.net/npm/node-relation@latest/dist/umd/index.min.js"></script>
<script>
  const A = new NodeRelation.Relationship().to('a', 'b', 'c')
</script>

Browser (esnext)

import { Relationship } from 'https://cdn.jsdelivr.net/npm/node-relation@latest/dist/esm/index.min.js'

Node.js

import { Relationship } from 'node-relation'

const A = new Relationship().to('a', 'b', 'c')

Migration 3.x.x to 4.x.x

Check readme

Methods

The data inside the instance is immutable. The method does not modify the data inside, it returns the result of the calculation as a new instance.

constructor(dataset?: RelationData[]): Relationship

You can pass dataset parameter to init this instance. The RelationData is type of 2-dimensional array. Check dataset getter description.

const state = new Relationship([['language', ['English', 'Korean', 'Japanese']]])
const clone = new Relationship(state.dataset)

(getter) dataset: RelationData[]

Returns as 2-dimensional array of relationships between nodes in the instance. Relationships are returned to saveable data-type(json).

const state = new Relationship().to('a', 'b').to('b', 'c', 'd')
state.dataset // [ [a,['b']], [b,['c', 'd']] ]

(getter) nodes: RelationNode[]

Get all nodes from the instance.

const state = new Relation().to('a', 'b').to('b', 'c')
state.nodes // a, b, c

(getter) nodeset: Set<RelationNode>

Get all nodes as Set object from the instance.

const state = new Relation().to('a', 'b').to('b', 'c')
state.nodeset // Set<['a', 'b', 'c']>

to(source: RelationNode, ...targets: RelationNode[]): Relationship

Creates a new refer between nodes, and returns it as a Relationship instance. This is one-sided relationship between both nodes.

const A = new Relationship().to('language', 'English', 'Korean', 'Japanese')

# A
language ─> English
language ─> Korean
language ─> Japanese

both(a: RelationNode, ...b: RelationNode[]): Relationship

Creates a new relationship between nodes, and returns it as a new Relationship instance. Both nodes will know each other.

const A = new Relationship().to('language', 'English', 'Korean', 'Japanese')
const B = A.both('English', 'US', 'France', 'Italy')

# A
language ─> English
language ─> Korean
language ─> Japanese

# B
language ─> English
            (English <─> US)
            (English <─> France)
            (English <─> Italy)
language ─> Korean
language ─> Japanese

all(...nodes: RelationNode[]): Relationship

Creates a new relationship between all each other nodes, and returns it as a new Relationship instance. All nodes will know each others.

const Team = new Relationship().all('john', 'harris', 'richard')

# Team
john <─> harris
harris <─> richard
richard <─> john

from(source: RelationNode[], depth?: number = -1): Relationship

Only the nodes that are related to the node received by the parameter are filtered and returned in a new Relationship instance. You can control calculation depth relationship with depth parameter. If depth parameter are negative, it's will be calculate all relationship between nodes in instance. Depth parameter default value is -1.

A.from('language').nodes // language, English, Korean, Japanese
B.from('English').nodes // language, English, US, France, Italy

where(filter: (node: RelationNode, i: number, array: RelationNode[]) => boolean): Relationship

Returns a new relationship instance with only nodes that meet the conditions.

A.where((v) => v.includes('Kor')).nodes // Korean

without(...nodes: RelationNode[]): RelationNode[]

Returns the remaining nodes except those received as parameters from the current relationship instance.

A.from('language').without('language') // English, Korean, Japanese

unlinkTo(source: RelationNode, ...targets: RelationNode[]): Relationship

Deletes the relationship between nodes and returns it as a new Relationship instance. This is one-sided cut off between both nodes.

B.unlinkTo('English', 'France')

unlinkBoth(a: RelationNode, ...b: RelationNode[]): Relationship

Deletes the relationship between nodes and returns it as a new Relationship instance. Both nodes will cut off each other.

B.unlinkBoth('English', 'France')

drop(...nodes: RelationNode[]): Relationship

Delete the node. If the node associated with the deleted node is isolated, it is deleted together. Returns the result with a new Relationship instance.

B.drop('language').nodes // English, US, France, Italy

has(node: RelationNode): Boolean

Returns whether the instance contains that node.

const hasKorean = B.has('korean') // true

hasAll(...nodes: RelationNode[]): Boolean

Returns whether the instance contains all of its nodes.

const hasAll = B.hasAll('Japanese', 'Korean') // true

clear(): void

Destroy the data in the instance. It is used for garbage collector.

Try it simply

const state = new Relationship()
            .to('language', 'English', 'Korean', 'Japanese')
            .both('English', 'US', 'France', 'Italy')

console.log(`Languages: ${ state.from('language').without('language') }`)
// Languages: English, Korean, Japanese, US, France, Italy

console.log(`English country: ${ state.from('English').drop('language').without('English') }`)
// English country: US, France, Italy 

Applying (Advanced usage, with Typescript)

// The data structure what you want
// {
//   'server-a': [userA, userB],
//   'server-b': [userC]
// }

import { Relationship } from 'node-relation'

type ServerName = 'server-a' | 'server-b'
class User {
  ...
}

const userA = new User
const userB = new User
const userC = new User

let state: Relationship<ServerName|User> = new Relationship

state = state.to('server-a', userA, userB)
state = state.to('server-b', userC)

console.log( state.from('server-b').without('server-b') ) // userC

import { Relationship } from 'node-relation'

class Human {
    name: string
    constructor(name: string) {
        this.name = name
    }
    sayHello() {
        console.log(`${this.name}: Hello, my name is ${this.name}`)
    }
}

// Team A
const john      = new Human('john') // leader
const paul      = new Human('paul')
const lawrence  = new Human('lawrence')

// Team B
const jacob     = new Human('jacob') // leader
const richard   = new Human('richard')
const collin    = new Human('collin')

// Manager
const manager   = new Human('harris')

// Create relationship
let state: Relationship<Human> = new Relationship

state = state.to(manager, john, jacob)
             .all(john, paul, lawrence)
             .all(jacob, richard, collin)

console.log(`${manager.name}: Here are the leaders of my team.`)
state.from(manager, 1).without(manager).forEach((leader: Human) => {
    leader.sayHello()
    console.log(`${leader.name}: And... these are my teammates.`)
    state.from(leader).without(leader).forEach((member: Human) => {
        member.sayHello()
    })
})