flatten JSON

flatten_json.coffee

window.flattenJSON = (obj) ->
  flattened = {}

  join = (path, key) ->
    (if path is "" then "" else path + "_") + key

  flattenArray = (arr, path) ->
    flattenElement(arr, path, i) for i in [0...arr.length]
      
  flattenObject = (obj, path) ->
    flattenElement(obj, path, key) for own key of obj
        
  flattenElement = (obj, path, key) ->
    if (toString.call(obj[key]) is '[object Array]')
      flattenArray(obj[key], join(path, key))
    else if (typeof obj[key] is "object")
      flattenObject(obj[key], join(path, key))
    else
      flattened[join(path, key)] = obj[key]

  flattenObject(obj, "")
  flattened

# window.flattenJSON = (obj) ->
#   flattened = {}

#   join = (path, key) ->
#     (if path is "" then "" else path + "_") + key

#   flattenArray = (arr, path) ->
#     flattenElement(arr, path, i) for i in [0...arr.length]

#   flattenObject = (obj, path) ->
#     flattenElement(obj, path, key) for own key of obj

#   flattenElement = (obj, path, key) ->
#     if (toString.call(obj[key]) is '[object Array]')
#       flattenArray(obj[key], join(path, key))
#     else if (typeof obj[key] is "object")
#       flattenObject(obj[key], join(path, key))
#     else
#       flattened[join(path, key)] = obj[key]

#   flattenObject(obj, "")
#   flattened

window.flattenJSON = (obj) ->
  flattened = {}

  join = (path, key) ->
    (if path is "" then "" else path + "_") + key

  flattenObject = (obj, path) ->
    flattenElement(obj, path, key) for own key of obj

  flattenElement = (obj, path, key) ->
    if (Object.prototype.toString.call(obj[key]) is '[object Object]')
      flattenObject(obj[key], join(path, key))
    else
      flattened[join(path, key)] = obj[key]

  flattenObject(obj, "")
  flattened