Functions to utilize localStorage as arrays of json objects

localStorageArrays.coffee

initLocalStorageArray = (name)->
  if (localStorage.getItem(name)==null)||(localStorage.getItem(name)[0]!='[')
    localStorage.setItem(name,'[]')

offlineArrays = ['array1','array2']
offlineArrays.forEach (n)->initLocalStorageArray(n)

clearArrays = ->
  offlineArrays.forEach (n)->localStorage.setItem(n,'[]')

addToLocalStorageArray = (name, entry, filt=(->true))->
  entries = JSON.parse(localStorage.getItem(name))
  entries = _.filter entries, filt
  entries.push _.omit(entry, '_id')
  localStorage.setItem(name, JSON.stringify(entries))

getFromLocalStorageArray = (name, filt=(->true))->
  entries = _.values JSON.parse(localStorage.getItem(name))
  entries = _.filter entries, filt
  return entries

setLocalStorageArray = (name, val)->
  localStorage.setItem(name, JSON.stringify(val))

removeFromLocalStorageArray = (name, val)->
  out = []
  entries = _.values JSON.parse(localStorage.getItem(name))
  _.each entries, (e)->
    if !Meteor.util.deepCompare(e, val)
      out.push(e)
  localStorage.setItem(name, JSON.stringify(out))