Dart/Flutter How to access element of Map inside a list

Question

How to access a Map element value by key, when a Map is inside a list?

'rooms': [
        {
          'roomNumber': 1,
          'roomBeds': 1,
          'roomColor': 1,
          'roomNumOfDwellers': 0,
          'roomDwellers': [
          ]
        },
        {
          'roomNumber': 2,
          'roomBeds': 3,
          'roomColor': 2,
          'roomNumOfDwellers': 0,
          'roomDwellers': [
          ]
        },
      ]

Tried this, doesn't work:

myPODO.rooms[1].['roomBeds']

The error message is:

Class '_InternalLinkedHashMap' has no instance getter 'roomBeds'. Receiver: _LinkedHashMap len:5 Tried calling: roomBeds

Can we see how your getting myPODO?

dshukertjr
– dshukertjr

2020-04-29 11:22:38 +00:00
Commented Apr 29, 2020 at 11:22 — dshukertjr
– dshukertjr, Commented Apr 29, 2020 at 11:22

GJJ2019 · Accepted Answer · 2020-11-13 17:26:12Z

4

try to replace

myPODO.rooms[1].['roomBeds']

with

myPODO.rooms[1]['roomBeds']

answered Nov 13, 2020 at 17:26

GJJ2019

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Comments

gegobyte · Accepted Answer · 2020-04-29 11:22:55Z

3

Store the items in a list of Map and you can then print the values by key names.

void main() {

  List<Map<String, dynamic>> rooms = [
        {
          'roomNumber': 1,
          'roomBeds': 1,
          'roomColor': 1,
          'roomNumOfDwellers': 0,
          'roomDwellers': [
          ]
        },
        {
          'roomNumber': 2,
          'roomBeds': 3,
          'roomColor': 2,
          'roomNumOfDwellers': 0,
          'roomDwellers': [
          ]
        },
      ];

  print(rooms[1]['roomBeds']);
}

answered Apr 29, 2020 at 11:22

gegobyte

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1 Comment

Aleksander Barsukov Over a year ago

It worked, thank you very much! The problem was in the dot between rooms[1] and ['roomBeds'], it wasn't needed.

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