How to return specific variable by passed variable name flutter?

Question

I have levels screen and I want when I press on level 1 for example I want to get the list of level 1 is there a way to get it without using if or switch just like by passing the name of the list then return the list that I passed its name or something like that

Thanks

List<Map<String, Object>> question(var s)
{
 _1 = const [
    {
    'question':
    'In which month does the German festival of Oktoberfest mostly take place?',
    'answers': [
      {'answerText': 'January', 'score': false},
      {'answerText': 'October', 'score': false},
      {'answerText': 'September', 'score': true},
    ],
  },
  {
    'question': 'Who composed the music for Sonic the Hedgehog 3?',
    'answers': [
      {'answerText': 'Britney Spears', 'score': false},
      {'answerText': 'Timbaland', 'score': false},
      {'answerText': 'Michael Jackson', 'score': true},
    ],
  },
  {
    'question': 'In Georgia (the state), it’s illegal to eat what with a fork?',
    'answers': [
      {'answerText': 'Hamburgers', 'score': false},
      {'answerText': 'Fried chicken', 'score': true},
      {'answerText': 'Pizza', 'score': false},
    ],
  },
 
];
 return s;
}}

Kaushik Chandru · Accepted Answer · 2022-08-05 14:42:36Z

0

You can try this.. The method question will fetch the item in the index you pass. If you pass 0 it will fetch the first map from the list and return it..

import "dart:async";




void main() {
  List<Map<String, Object>> singleObject = question(0);
  
  print(singleObject[0]['question']);
  print(singleObject[0]['answers']);
}


List<Map<String, Object>> question(int s)
{
 List<Map<String, Object>> _1 = const [
    {
    'question':
    'In which month does the German festival of Oktoberfest mostly take place?',
    'answers': [
      {'answerText': 'January', 'score': false},
      {'answerText': 'October', 'score': false},
      {'answerText': 'September', 'score': true},
    ],
  },
  {
    'question': 'Who composed the music for Sonic the Hedgehog 3?',
    'answers': [
      {'answerText': 'Britney Spears', 'score': false},
      {'answerText': 'Timbaland', 'score': false},
      {'answerText': 'Michael Jackson', 'score': true},
    ],
  },
  {
    'question': 'In Georgia (the state), it’s illegal to eat what with a fork?',
    'answers': [
      {'answerText': 'Hamburgers', 'score': false},
      {'answerText': 'Fried chicken', 'score': true},
      {'answerText': 'Pizza', 'score': false},
    ],
  },
 
];
  List<Map<String, Object>> _2 = const [
    {
    'question':
    'In which month does the German festival of Oktoberfest mostly take place?',
    'answers': [
      {'answerText': 'January', 'score': false},
      {'answerText': 'October', 'score': false},
      {'answerText': 'September', 'score': true},
    ],
  },
  {
    'question': 'Who composed the music for Sonic the Hedgehog 3?',
    'answers': [
      {'answerText': 'Britney Spears', 'score': false},
      {'answerText': 'Timbaland', 'score': false},
      {'answerText': 'Michael Jackson', 'score': true},
    ],
  },
  {
    'question': 'In Georgia (the state), it’s illegal to eat what with a fork?',
    'answers': [
      {'answerText': 'Hamburgers', 'score': false},
      {'answerText': 'Fried chicken', 'score': true},
      {'answerText': 'Pizza', 'score': false},
    ],
  },
 
];
  
  List allQuestions = [_1,_2];
 return allQuestions[s];
}

edited Aug 5, 2022 at 14:42

answered Aug 5, 2022 at 13:20

Kaushik Chandru

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3 Comments

Terminator Over a year ago

it seems like you misunderstand my question I don't want to return the question I want to return the whole list "_1"

Kaushik Chandru Over a year ago

So just return _1 instead of _1[s]

Terminator Over a year ago

for example I have 10 levels when the user choose level 5 it will return _5 so I want a way to return the list of chosen level without use if return for every level

HKN · Accepted Answer · 2022-08-05 14:54:08Z

0

You can use maps. The key of the map will be the level name, and the value will be the list of questions.

For Example:

Map<String, List<Map<String, Object>>> leveledQuestionsMap = {
   "L1" : [firstLevelQuestions],
   "L2" : [secondLevelQuestions],
   "L3" : [thirdLevelQuestions],
}

and then make a function that takes level and returns the values from the map:

List<Map<String, Object>> bringQuestionOfLevel(String level){
   return leveledQuestionsMap[level];
}

edited Aug 5, 2022 at 14:54

answered Aug 5, 2022 at 13:33

HKN

3641 silver badge9 bronze badges

5 Comments

Terminator Over a year ago

thanks but when I use the function to get the list it gives me an error ======= this is some of my code List<List<Map<String, Object>>> _questions = Q().bringQuestionOfLevel(e) ; ----- _questions[_questionIndex]['question'],

Terminator Over a year ago

lib/home.dart:125:48: Error: A value of type 'String' can't be assigned to a variable of type 'int'. _questions[_questionIndex]['question'], ^

Terminator Over a year ago

lib/home.dart:125:48: Error: A value of type 'String' can't be assigned to a variable of type 'int'. _questions[_questionIndex]['question'], ^ lib/home.dart:125:47: Error: The argument type 'Map<String, Object>' can't be assigned to the parameter type 'String'. - 'Map' is from 'dart:core'. - 'Object' is from 'dart:core'. _questions[_questionIndex]['question'], ^

Terminator Over a year ago

lib/home.dart:135:46: Error: A value of type 'String' can't be assigned to a variable of type 'int'. ...(_questions[_questionIndex]['answers'] ^

HKN Over a year ago

Share the updated code in the question above.

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