CODEWITHSUNDEEP
flutterdart
Denis Ramdan
Denis Ramdan

Reputation: 1954

How to remove specific items from a list?

How to remove items on List<ReplyTile> with id = 001.. ?

final List<ReplyTile> _replytile = <ReplyTile>[];

_replytile.add(
    ReplyTile(
        member_photo: 'photo',
        member_id: '001',
        date: '01-01-2018',
        member_name: 'Denis',
        id: '001',
        text: 'hallo..'
    )
);

Upvotes: 90

Views: 179690

Answers (7)

atreeon
atreeon

Reputation: 24177

It is sometimes more reliable to create a new list from an existing one. Modifying a list could create pass-by-reference errors. If a list is passed as a parameter, calling remove might alter the list outside of your function thereby creating unexpected results and hard to find bugs.

To create a new list from an old one just filter the results

var newList = oldList.where((x) => x.id != id)

or use something like whereNot in DartX

var newList = oldList.whereNot((x) => x.id == id)

That being said creating a new list would allocate more memory every time you create a new list. An alternative would be to create a new list before you modify it, for example:

var safeList = [...oldList];
safeList.removeWhere((item) => item.id == '001')

Upvotes: 1

Rahul Raj
Rahul Raj

Reputation: 1503

Here the simple list functions with sample output

Consider the sample list

List sampleList = ["001", "002", "003"];

Here some add to list functions with output

//Add to list

  sampleList.add("004");
//Output: 001 002 003 004

//Add to specific index

  sampleList.insert(0, "005");
//Output: 005 001 002 003

Here the list remove functions with examples consider the same sample list

sampleList.removeWhere((item) => item.id == '003');
//Output: 001 002

//Remove item from secific index

  sampleList.removeAt(2);
//Output: 001 003

//Remove item from last

  sampleList.removeLast();
//Output: 001 002

//Remove items between range

  sampleList.removeRange(1, 2);
//Output: 002 003

Upvotes: 1

Codemaker2015
Codemaker2015

Reputation: 15699

//For removing specific item from a list with the attribute value
replytile.removeWhere((item) => item.id == '001') 

//Remove item by specifying the position of the item in the list
replytile.removeAt(2)   

//Remove last item from the list
replytile.removeLast()

//Remove a range of items from the list
replytile.removeRange(2,5)

Upvotes: 25

gsm
gsm

Reputation: 2426

if you have a generic list

List<int> sliderBtnIndex = [];//Your list

sliderBtnIndex.remove(int.tryParse(index)); //remove

Upvotes: 0

Suz&#39;l Shrestha
Suz&#39;l Shrestha

Reputation: 1107

In your case this works:

replytile.removeWhere((item) => item.id == '001');

For list with specific datatype such as int, remove also works.Eg:

List id = [1,2,3];
id.remove(1);

Upvotes: 35

SilenceCodder
SilenceCodder

Reputation: 3174

This also works 

_listofTaskUI.removeAt(_quantity);

Upvotes: 11

G&#252;nter Z&#246;chbauer
G&#252;nter Z&#246;chbauer

Reputation: 658057

removeWhere allows to do that:

replytile.removeWhere((item) => item.id == '001')

See also List Dartdoc

Upvotes: 214

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