DOUBLE LINKED LIST

Breaking Change - Migrating to V1.0.0

Version 1.0.0 changed the way you instantiate for node. See the getting started section for more on how to get started. Also please see change log for deprecated methods.

Getting Started

This is a simple double linked list. It has some tests but still use discretion. You will have to create a new object to use it so for browsers...

var linkedList =  new DoubleLinkedList()

and for node...

var DoubleLinkedList = require('double-linkedlist').DoubleLinkedList;
var linkedList =  new DoubleLinkedList();

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Changelog v1.0.0

• Updated documentation
• Updated build. Now includes minified version.
• Converted the build to UMD. As a result the instantiation process for node has changed.
• Cycle method has been removed. Please use Psychic method instead.

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Table of Contents

• DoubleLinkedList
  • onChange
  • canUndo
  • undo
  • clearUndo
  • isEmpty
  • getSize
  • insertAtStart
  • insertAtEnd
  • insertAtPosition
  • deleteAtPosition
  • deleteAll
  • removeNode
  • getTail
  • getHead
  • move
  • psychic
  • toArray
  • findAll
• Psychic-Callback
• Comparitor
• Callback
• LinkNode
  • getNext
  • getPrevious
  • setNext
  • setPrevious
  • hasNext
  • hasPrev
  • getProtectedData
  • appendData
  • getDataForKey
  • setData

DoubleLinkedList

Double Linked List

Meta

• author: Michael Montaque

onChange

Will trigger all the functions given to it when objects are added, removed or moved.

Parameters

• func function called when a change occurs

canUndo

determines if there are any more undo left

Returns boolean

undo

will undo the last modifying command

clearUndo

removes all the undo that the user can perform

isEmpty

is this data list empty?

Returns boolean

getSize

Returns the size of this list

Returns Number

insertAtStart

Inserts data at the start of the list

Parameters

• data (Object | Array) Data to store into the array

insertAtEnd

Inserts data at the end of the list

Parameters

• data (Object | Array) Data to store into the array

insertAtPosition

Inserts data at a specified position the list

Parameters

• data (Object | Array) Data to store into the array

deleteAtPosition

removes a node at the specified position

Parameters

• position Number index of the node you want to remove

deleteAll

removes all the nodes

removeNode

removes a node at the specified position

Parameters

• comparitor Comparitor function that cycles through each element returning the node and index. The user must return true or false to indicate whether or not the node should be removed.
• isReversed {Boolean} to cycle through the list in reverse

Examples

list.removeNode(function(node, idx){
     return node.id === 4
},true)

getTail

Returns Object the node at the end of the list

getHead

Returns Object the node at the start of the list

move

moves the object

Parameters

• oldIdx Number the index of the object you want to move
• newIdx Number the index you want to move the old object to

psychic

cycles through each node and returns it along with the previous node, the next node and the index to the callback. To break free from the cycle the user can return false or let it run to the end

Parameters

• callback Psychic-Callback function that cycles through each element returning the node and index.
• isReversed Boolean to cycle through the list in reverse

Examples

list.psychic(function(currentNode, previousNode, nextNode, idx){
     // Do something with the node
     // return true to keep going or false to stop
})

toArray

returns an array of the data

Returns Array the internal data as an array

findAll

removes a node at the specified position

Parameters

• comparitor (Comparitor | Object) function that cycles through each element returning the node and index. The user must return true or false to indicate whether or not the node should be removed. Or it can be an object and the method will find any node that matches the attribute's data

Examples

var array = list.findAll(function(node, idx){
     return node.id === 4
})
 
var list = list.findAll({id:4})

Psychic-Callback

Type: Function

Parameters

• currentNode LinkNode The current node object in the list
• previousNode LinkNode The previous node object in the list
• nextNode LinkNode The next node object in the list
• idx Number index of the object in the list

Returns boolean Optionally the user can return false to break free from the cycle early

Comparitor

Type: Function

Parameters

• node LinkNode object in the list
• idx Number index of the object in the list

Returns boolean the user should return true any time a condition is met while comparing the node

Callback

Type: Function

Parameters

• node LinkNode object in the list
• idx Number index of the object in the list

Returns boolean Optionally the user can return false to break free from the cycle early

LinkNode

class that represents the nodes that make up the list. Each of the node are referenced to at most two other nodes - a previous and a next.

Parameters

• data any object to store
• nextNode a node to reference as next
• previousNode a node to reference as previous

getNext

returns the node that is after the node that called this method

Returns any LinkNode

getPrevious

returns the node that is before the node that called this method

Returns any LinkNode

setNext

takes a node object and sets it as the next node in the linked list

Parameters

• obj Node the node object you want to set as next

setPrevious

takes a node object and sets it as the previous node in the linked list

Parameters

• obj Node the node object you want to set as previous

hasNext

true if there is another node linked after the node that is caller of this method

Returns any Boolean

hasPrev

true if there is another node linked before the node that is caller of this method

Returns any Boolean

getProtectedData

Returns any Object

Meta

• deprecated: Will be removed by version 1.0.0. (Please use the getData data method instead)

appendData

allows you to set data in the internal object.

Parameters

• data Object the information you want to store the node
• key String the property you want to store the data at

getDataForKey

getter for the internal data stored in the node

Parameters

• key String the attribute property name to access the data

setData

sets the internal data object

Parameters

• data Object the information you want to store the node