ios - Cannot subscript a value of type - Swift 3 -

i'm new swift , trying write application parse json webpage. i'm getting error "cannot subscript value of type '[dictionary]'"

how can fix this? occurs multiple times. following code. thanks!

func grabdata(results: [dictionary<string, any?>]){     guard let resultlist = results as? [dictionary<string, any?>] else { return }         iresult in resultlist {             var tempresult = searchresult()             tempresult.studentid = self.getint(dict: [iresult], string: "studentid")             tempresult.lastname = self.getstring(dict: [iresult], string: "lastname")             tempresult.firstname = self.getstring(dict: [iresult], string: "firstname")             tempresult.major = self.getstring(dict: [iresult], string: "major")             tempresult.year = self.getstring(dict: [iresult], string: "year")             tempresult.gpa = self.getdouble(dict: [iresult], string: "gpa")             self.results.append(tempresult)         }     dispatchqueue.main.async {         self.listtableview.reloaddata()     } }  func getstring(dict: [dictionary<string, any?>], string: string) -> string? {     if let result = dict[dictionary<string, any?>] as? string {         return result     }     return nil }  func getint(dict: [dictionary<string, any?>], string: string) -> int? {     if let result = dict[string] as? int {         return result     }     return nil }  func getdouble(dict: [dictionary<string, any?>], string: string) -> double? {     if let result = dict[string] as? double {         return result     }     return nil } 

searchresult.swift

struct searchresult {     let studentid: int     let lastname: string     let firstname: string     let major: string     let year: string     let gpa: double      init?(json: [string:anyobject]) {         guard let studentid = json["studentid"] as? int else {             return nil         }          guard let lastname = json["lastname"] as? string else {             return nil         }          guard let firstname = json["firstname"] as? string else {             return nil         }          guard let major = json["major"] as? string else {             return nil         }          guard let year = json["year"] as? string else {             return nil         }          guard let gpa = json["gpa"] as? double else {             return nil         }          self.studentid = studentid         self.lastname = lastname         self.firstname = firstname         self.major = major         self.year = year         self.gpa = gpa     } } 

viewcontroller.swift

func grabdata(json: [string:anyobject]) {     guard let searchresult = searchresult(json) else {         return     }      self.results.append(searchresult)      dispatchqueue.main.async {         self.listtableview.reloaddata()     } } 

this post helpful me when designing model interact rest api: https://developer.apple.com/swift/blog/?id=37

the structure of json makes difference.

for example:

[     {         "studentid": 12345,         "lastname": "smith"     } ] 

would represented [[string:anyobject]] (an array of string , anyobject combinations)

if have this, need loop through , parse each element individually.