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How to access and edit a value of a existent key of a map that's inside a list on Dart/Flutter?

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I'm create a list of maps, each map have two keys ["title"] and ["time"], all the values of keys is submitted in a setState method, with the values submited as Strings by a button, and a map object is added inside the list, that's List _tasks = [], so what I would like to do is access the ["time"] element of the last Map added in the list and be able to change the value.

This is part of a little project of application, to help me to learn more about Flutter. The repository of application is on Github on https://github.com/jsdaniell/remindme

The list is declared:

List _tasks = [];

The function that's adding a map object to the list:

void _addTask() 
 setState(
 () 
 Map<String, dynamic> newTask = Map();
 newTask["title"] = _taskController.text;
 newTask["time"] = _timeGlobal.toString();
 _taskController.text = "";
 _tasks.add(newTask);


 ,
 );

 

The point is that I want to subtract a value of 1 every second of variable _timeGlobal, what's a int in the global scope and is the value that is set as a String in the ["time"] in the Map, so I write this code:

 String countdownTime(Map newTask) 

 Timer timer = new Timer.periodic(new Duration(seconds: 1), (timer) 

 // Here I want to access the value of ["time"] element, where's in the last position of list and update the value.

 _saveData();

 return Home();

 );

 // Stop the periodic timer using another timer which runs only once after specified duration

 new Timer(new Duration(minutes: _timeGlobal), () 
 timer.cancel();
 );
 

I hope that have some way to access the last map in a list of maps, and a specific key on this map.

dart flutter

share|improve this question

edited Mar 26 at 1:39

Tomka Koliada

1,27022 gold badges88 silver badges2828 bronze badges

asked Mar 25 at 20:32

jsdanielljsdaniell

622 bronze badges

add a comment | 

0

I'm create a list of maps, each map have two keys ["title"] and ["time"], all the values of keys is submitted in a setState method, with the values submited as Strings by a button, and a map object is added inside the list, that's List _tasks = [], so what I would like to do is access the ["time"] element of the last Map added in the list and be able to change the value.

This is part of a little project of application, to help me to learn more about Flutter. The repository of application is on Github on https://github.com/jsdaniell/remindme

The list is declared:

List _tasks = [];

The function that's adding a map object to the list:

void _addTask() 
 setState(
 () 
 Map<String, dynamic> newTask = Map();
 newTask["title"] = _taskController.text;
 newTask["time"] = _timeGlobal.toString();
 _taskController.text = "";
 _tasks.add(newTask);


 ,
 );

 

The point is that I want to subtract a value of 1 every second of variable _timeGlobal, what's a int in the global scope and is the value that is set as a String in the ["time"] in the Map, so I write this code:

 String countdownTime(Map newTask) 

 Timer timer = new Timer.periodic(new Duration(seconds: 1), (timer) 

 // Here I want to access the value of ["time"] element, where's in the last position of list and update the value.

 _saveData();

 return Home();

 );

 // Stop the periodic timer using another timer which runs only once after specified duration

 new Timer(new Duration(minutes: _timeGlobal), () 
 timer.cancel();
 );
 

I hope that have some way to access the last map in a list of maps, and a specific key on this map.

dart flutter

share|improve this question

edited Mar 26 at 1:39

Tomka Koliada

1,27022 gold badges88 silver badges2828 bronze badges

asked Mar 25 at 20:32

jsdanielljsdaniell

622 bronze badges

add a comment | 

I'm create a list of maps, each map have two keys ["title"] and ["time"], all the values of keys is submitted in a setState method, with the values submited as Strings by a button, and a map object is added inside the list, that's List _tasks = [], so what I would like to do is access the ["time"] element of the last Map added in the list and be able to change the value.

This is part of a little project of application, to help me to learn more about Flutter. The repository of application is on Github on https://github.com/jsdaniell/remindme

The list is declared:

List _tasks = [];

The function that's adding a map object to the list:

void _addTask() 
 setState(
 () 
 Map<String, dynamic> newTask = Map();
 newTask["title"] = _taskController.text;
 newTask["time"] = _timeGlobal.toString();
 _taskController.text = "";
 _tasks.add(newTask);


 ,
 );

 

The point is that I want to subtract a value of 1 every second of variable _timeGlobal, what's a int in the global scope and is the value that is set as a String in the ["time"] in the Map, so I write this code:

 String countdownTime(Map newTask) 

 Timer timer = new Timer.periodic(new Duration(seconds: 1), (timer) 

 // Here I want to access the value of ["time"] element, where's in the last position of list and update the value.

 _saveData();

 return Home();

 );

 // Stop the periodic timer using another timer which runs only once after specified duration

 new Timer(new Duration(minutes: _timeGlobal), () 
 timer.cancel();
 );
 

I hope that have some way to access the last map in a list of maps, and a specific key on this map.

dart flutter

share|improve this question

edited Mar 26 at 1:39

Tomka Koliada

1,27022 gold badges88 silver badges2828 bronze badges

asked Mar 25 at 20:32

jsdanielljsdaniell

622 bronze badges

List _tasks = [];

void _addTask() 
 setState(
 () 
 Map<String, dynamic> newTask = Map();
 newTask["title"] = _taskController.text;
 newTask["time"] = _timeGlobal.toString();
 _taskController.text = "";
 _tasks.add(newTask);


 ,
 );

 

 String countdownTime(Map newTask) 

 Timer timer = new Timer.periodic(new Duration(seconds: 1), (timer) 

 // Here I want to access the value of ["time"] element, where's in the last position of list and update the value.

 _saveData();

 return Home();

 );

 // Stop the periodic timer using another timer which runs only once after specified duration

 new Timer(new Duration(minutes: _timeGlobal), () 
 timer.cancel();
 );
 

dart flutter

dart flutter

share|improve this question

edited Mar 26 at 1:39

Tomka Koliada

1,27022 gold badges88 silver badges2828 bronze badges

asked Mar 25 at 20:32

jsdanielljsdaniell

622 bronze badges

share|improve this question

edited Mar 26 at 1:39

Tomka Koliada

1,27022 gold badges88 silver badges2828 bronze badges

asked Mar 25 at 20:32

jsdanielljsdaniell

622 bronze badges

edited Mar 26 at 1:39

Tomka Koliada

1,27022 gold badges88 silver badges2828 bronze badges

edited Mar 26 at 1:39

Tomka Koliada

1,27022 gold badges88 silver badges2828 bronze badges

asked Mar 25 at 20:32

jsdanielljsdaniell

622 bronze badges

asked Mar 25 at 20:32

jsdanielljsdaniell

622 bronze badges

1 Answer
1

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0

to access to the last element in the list you can use :
_tasks[_tasks.length - 1];
so if you want the "time" key from the Map thats inside the last element of your list use :
var lastTime = _tasks[_tasks.length - 1]["time"];

share|improve this answer

edited Mar 25 at 22:06

answered Mar 25 at 22:00

abdalmonemabdalmonem

14455 bronze badges

add a comment | 

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0

to access to the last element in the list you can use :
_tasks[_tasks.length - 1];
so if you want the "time" key from the Map thats inside the last element of your list use :
var lastTime = _tasks[_tasks.length - 1]["time"];

share|improve this answer

edited Mar 25 at 22:06

answered Mar 25 at 22:00

abdalmonemabdalmonem

14455 bronze badges

add a comment | 

0

to access to the last element in the list you can use :
_tasks[_tasks.length - 1];
so if you want the "time" key from the Map thats inside the last element of your list use :
var lastTime = _tasks[_tasks.length - 1]["time"];

share|improve this answer

edited Mar 25 at 22:06

answered Mar 25 at 22:00

abdalmonemabdalmonem

14455 bronze badges

add a comment | 

to access to the last element in the list you can use :
_tasks[_tasks.length - 1];
so if you want the "time" key from the Map thats inside the last element of your list use :
var lastTime = _tasks[_tasks.length - 1]["time"];

share|improve this answer

edited Mar 25 at 22:06

answered Mar 25 at 22:00

abdalmonemabdalmonem

14455 bronze badges

share|improve this answer

edited Mar 25 at 22:06

answered Mar 25 at 22:00

abdalmonemabdalmonem

14455 bronze badges

answered Mar 25 at 22:00

abdalmonemabdalmonem

14455 bronze badges

answered Mar 25 at 22:00

abdalmonemabdalmonem

14455 bronze badges