Basic LocalStorage Array with limit, uid, search functionality

#coffeescript

#objects

#array

#localstorage

#javascript

#abstract

Hi,

I have made this small little gem that can be quickly implemented to store and grab array info. I needed to store the last amount of items sorted by latest clicked, to oldest. I used this array to do the unshifting, popping, pushing, purging etc. It works best for saving history as it has all the stuff that is needed for it (limited amount, search to delete objects in the array)

Anyway here is the coffeescript, the public part is the stuff you want to use:

 Array::remove = (from, to) ->
 rest = @slice((to or from) + 1 || @length)
 @length = if from < 0 then this.length + from else from
 @push.apply @, rest

# Simple class that makes array extend into the localstorage and updates accordingly
class @LocalStorageArray
 constructor: ( @strUid = undefined, @numLimit = 0 ) ->
 if not @strUid
 @strUid = do () ->
 numTotal = 10
 numString = ''
 for i in [0...numTotal] by 1 then numString = numString + Math.floor((1 + Math.random()) * 0x10000).toString(16).substring(1)
 numString


 ## Private

 _fetch: ->
 @arrItems = localStorage.getItem @strUid
 @arrItems = if @arrItems then JSON.parse(@arrItems) else []
 @arrItems
 _update: ->
 localStorage.setItem @strUid, JSON.stringify(@arrItems)
 @_fetch()
 _do: ( fnCallback, arrArguments = [] ) ->
 @_fetch()
 fnCallback.bind(@).apply @, arrArguments
 @_update()
 _checkLimit: ( boolReverse = false ) ->
 if @numLimit
 numDifference = @arrItems.length - @numLimit
 if numDifference > 0
 if boolReverse
 @arrItems = @arrItems.slice 0, @arrItems.length-numDifference
 else
 @arrItems = @arrItems.slice numDifference


 ## Public

 setKey: ( @strUid ) ->
 getKey: -> @strUid
 get: -> @_fetch()
 set: ( @arrItems ) -> @_update()
 unshift: ( anyItem ) ->
 @_do (( anyItem ) ->
 @arrItems.unshift anyItem
 @_checkLimit true
 ), [anyItem]
 push: ( anyItem ) -> 
 @_do (( anyItem ) ->
 @arrItems.push anyItem
 @_checkLimit false
 ), [anyItem]
 pop: -> @_do -> @arrItems.pop()
 purge: -> @_do -> @arrItems = []
 remove: ( numIndex ) -> @_do -> @arrItems.remove numIndex
 searchAndDestroy: ( strProperty, strValue ) ->
 objMatched = @matchProperty(strProperty, strValue)
 if objMatched.matched then @remove objMatched.index



 matchProperty: ( strProperty, strValue ) ->
 # Tries to match on property in objects in the array for searching for duplicates
 @_fetch()
 objMatched =
 matched: false
 index: 0

 for objItem in @arrItems by 1
 if typeof objItem is 'object'
 if objItem[strProperty] is strValue
 objMatched =
 matched: true
 index: _i
 break;

 objMatched