swift experimentations

gistfile1.swift

let fieldAliases: [String: String] =
[
    "SCMActionConfirmed"   : "confirmed",
    "SCMAmount"            : "amount",
    "SCMBrand"             : "brand",
    "SCMCategory"          : "category",
    "SCMCurrency"          : "currency",
    "SCMDescription"       : "description",
    "SCMProductID"         : "identifier",
    "SCMProductImageURL"   : "photo",
    "SCMProductName"       : "fn",
    "SCMProductURL"        : "url",
    "SCMQuantity"          : "quantity",
    "SCMSalePrice"         : "price",
    "SCMScore"             : "score",
    "SCMTimestamp"         : "date",
    "SCMValidityTimestamp" : "valid"
]

let customerAliases: [String: String] =
[
    "SCMCustomerAgeGroup"   :"agegroup",
    "SCMCustomerEducation"  :"education",
    "SCMCustomerGender"     :"gender",
    "SCMCustomerID"         :"identifier",
    "SCMCustomerMHash"      :"mhash",
    "SCMCustomerSegment"    :"segment",
    "SCMCustomerTargeting"  :"targeting"
]

let aliases: [String: String] = $.merge( dictionaries:  fieldAliases, customerAliases )


/**
 * Function changes the keys of an object given by the client into the keys that the server expects.
 */
private func mapAliases( parameters: [String: AnyObject] ) -> [String: AnyObject]
{
  var _parameters: [String: AnyObject] = [:]

  for ( key, value ) in parameters
  {
      var _key = nil != aliases[key] ? aliases[key]! : key
      
      if let dictionary = value as? [String: AnyObject]
      {
          _parameters[_key] = self.mapAliases( dictionary )
      }
      else if let array = value as? [[String: AnyObject]]
      {
          _parameters[_key] = array.map( self.mapAliases )
          //equivalent de 
          _parameters[_key] = array.map { self.mapAliases( $0 ) }
          // mais en plus rapide, vu que y'a pas de creation de closures
      }
      else
      {
          _parameters[_key] = value
      }
  }
  
  return _parameters
}

/*
quand la signature de mapAliases c'etait
private func mapAliases( parameters: [String: AnyObject]? ) -> [String: AnyObject]
ca marchait pas, a cause de parameters qui etaient optionel ^
du coup ca matchait pas la signature de la fonction `map`

probleme? pas d'erreur detectees par XCode, mais runtime error.
*/