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Circular-linked-list

Circular singly linked list implementation, heavily based on Singlie by Klaus Sinani.

Installation

$ npm install --save circular-linked-list

Usage

$ npm run lint
 
$ npm run test
 
$ npm run test:coverage
 
$ npm run dist
 
$ npm run deploy

const CircularLinkedList = require("circular-linked-list");
 
const list = new CircularLinkedList();
 
list.append("B").prepend("A");
 
console.log(list.node(0));
// => Node { value: 'A', next: Node { value: 'B', next: [CircularLinkedList] } }
 
console.log(list.node(0).next);
// => Node { value: 'B', next: Node { value: 'A', next: [CircularLinkedList] } }
 
console.log(list.node(0).next.next);
// => Node { value: 'A', next: Node { value: 'B', next: [CircularLinkedList] } }
 
console.log(
  list
    .map(x => `[${x}]`)
    .reverse()
    .toArray()
);
// => [ '[B]', '[A]' ]

API

list.append(value[, value])

• Return Type: Linked List

Appends one of more nodes to the list.

value

• Type: any

Can be one or more comma delimited values. Each value corresponds to a single node.

list.append("A", "B", "C", "D");
// => { value: 'A', next: { value: 'B', next: [List] } }

list.prepend(value[, value])

• Return Type: Linked List

Prepends one of more nodes to the list.

value

• Type: any

Can be one or more comma delimited values. Each value corresponds to a single node.

list.append("C", "D");
// => { value: 'C', next: [List] }
 
list.prepend("B", "A");
// => { value: 'A', next: { value: 'B', next: { value: 'C', next: [List] } } }

list.head

• Return Type: any

Returns the value of the first node / head on the list.

list.append("A", "B");
console.log(list.head);
// => A

list.last

• Return Type: any

Returns the value of the last node on the list.

list.append("A", "B");
console.log(list.last);
// => B

list.length

• Return Type: Integer

Returns the length of the list.

list.append("A", "B");
console.log(list.length);
// => 2

list.isEmpty()

• Return Type: Boolean

Checks whether or not the list is empty.

list.append("A", "B");
console.log(list.isEmpty());
// => false

list.insert({value[, value], index})

• Return Type: Linked List

Inserts one or more nodes to the given index.

value

• Type: any

Can be one or more comma delimited values. Each value corresponds to a single node.

index

• Type: Integer

Can be an integer corresponding to a list index.

list.append("A", "B", "E");
list.insert({ value: ["C", "D"], index: 1 });
// => { value: 'A', next: { value: 'D', next: { value: 'C', next: { value: 'B', next: [List] } } } }

list.node(index)

• Return Type: Node

Return the node corresponding to the given index.

index

• Type: Integer

Can be an integer corresponding to a list index.

list.append("A", "B", "C", "D");
const node = list.node(0);
console.log(node);
// => { value: 'A', next: { value: 'B', next: [List] } }
 
console.log(node.value);
// => A
 
console.log(node.next);
// => { value: 'B', next: [List] }

list.get(index)

• Return Type: any

Return the value of node corresponding to the given index.

index

• Type: Integer

Can be an integer corresponding to a list index.

list.append("A", "B");
console.log(list.get(0));
// => A
 
console.log(list.get(0));
// => B

list.remove(index)

• Return Type: Linked List

Removes from the list the node located to the given index.

index

• Type: Integer
• Default: list.length - 1

Can be an integer corresponding to a list index.

If not provided, the last node of the list will be removed.

list.append("A", "B", "C", "D");
// => { value: 'A', next: [List] }
 
list.remove(0);
// => { value: 'B', next: [List] }
 
list.remove(0);
// => { value: 'C', next: [List] }

list.toArray()

• Return Type: Array

Converts the list into an array.

list.append("A", "B", "C");
// => { value: 'A', next: { value: 'B', next: [List] } }
 
const array = list.toArray();
console.log(array);
// => [ 'A', 'B', 'C' ]

list.clear()

• Return Type: Empty Linked List

Removes all nodes from the list.

list.append("A", "B", "C");
// => { value: 'A', next: { value: 'B', next: [List] } }
 
list.clear();
// => null

list.join([separator])

• Return Type: String

Joins the values of all nodes on the list into a string and returns the string.

separator

• Type: String
• Default: Comma ','

Specifies a string to separate each pair of adjacent node values of the array.

If omitted, the node values are separated with a comma ','.

list.append("A", "B", "C");
// => { value: 'A', next: { value: 'B', next: [List] } }
 
console.log(list.join());
// => 'A,B,C'
 
console.log(list.join(""));
// => 'ABC'
 
console.log(list.join(" "));
// => 'A B C'

list.forEach(function)

• Return Type: undefined

Executes a provided function once for each node value.

function

• Type: Function

Function to execute for each node value.

const array = [];
list.append("A", "B", "C");
// => { value: 'A', next: { value: 'B', next: [List] } }
 
list.forEach(x => array.push(x));
console.log(array);
// => [ 'A', 'B', 'C' ];

list.map(function)

• Return Type: Linked List

Executes a provided function once for each node value.

function

• Type: Function

Function that produces a new node value for the new list.

list.append("A", "B", "C");
// => { value: 'A', next: { value: 'B', next: [List] } }
 
const mapped = list.map(x => `[${x}]`);
console.log(array.join(" "));
// => '[A] [B] [C]'

Licence

My work is released under the MIT licence. One can consider this project to be a fork of Singlie by Klaus Sinani.