Array LocalStorage básico com funcionalidade de limite, uid e pesquisa

Oi,

Eu fiz esta pequena joia que pode ser implementada rapidamente para armazenar e obter informações sobre o array. Eu precisava armazenar a última quantidade de itens classificados do último clicado até o mais antigo. Eu usei este array para fazer o unshifting, popping, push, purging etc. Funciona melhor para salvar o histórico, pois tem todas as coisas que são necessárias para ele (quantidade limitada, pesquisa para excluir objetos no array)

De qualquer forma, aqui está o coffeescript, a parte pública é o que você deseja usar:

    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