CODEWITHSUNDEEP
listflutterdartmaps
dheeraji
dheeraji

Reputation: 137

How can I access a value from a list of maps containing a list in Dart?

I'm attempting to extract a value from list contained in a list of maps, but am getting the following error: The operator '[]' isn't defined for the type 'Object'

From the following list, I'd like to access a value such as 'Pizza':

List<Map<String,Object>> questions = [
  {
    'question': 'What is your favorite food',
    'answers': [
      'Pizza',
      'Tacos',
      'Sushi',
    ],
  },
];

When I try to print an answer within the list of answers, it doesn't work:

// Does not work
// The operator '[]' isn't defined for the type 'Object'
print(questions[0]['answers'][0]);

I'm able to save the answers list into a variable to of type list then print a specific list item:

// Works
List answerList = questions[0]['answers'];
print(answerList[0]);

Why doesn't the first way work, and how can I get this to work with one command?

Upvotes: 0

Views: 1036

Answers (1)

ByteMe
ByteMe

Reputation: 1670

Rather than returning an Object return a dynamic as it has an operator []

List<Map<String, dynamic>> questions = [
    {
      'question': 'What is your favorite food',
      'answers': [
        'Pizza',
        'Tacos',
        'Sushi',
      ],
    },
  ];

Upvotes: 2

Related Questions