Flutter how to convert String to List

Question

I have this String.

  var String a = '["one", "two", "three", "four"]';
  var ab = (a.split(','));
  print(ab[0]); // return ["one"

I want to convert this to List<String>. The problem is it returns square bracket too. I want to List looks this ["one", "two", "three", "four"] not [["one", "two", "three", "four"]]. How can I convert this properly?

Günter Zöchbauer · Accepted Answer · 2022-11-07T08:59:38.203

44

Your string looks like a valid JSON, so this should work for you:

New (proper generic type

import 'dart:convert';
...

var a = '["one", "two", "three", "four"]';
var ab = json.decode(a).cast<String>().toList();
print(ab[0]); // returns "one"

Old

import 'dart:convert';
...

var a = '["one", "two", "three", "four"]';
var ab = json.decode(a);
print(ab[0]); // returns "one"

edited Nov 07 '22 at 08:59

answered Sep 12 '18 at 06:15

Günter Zöchbauer

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4

how to do if list is not a valid JSON – salih kallai Oct 17 '19 at 05:16
2

Then you need to parse the string with custom code. – Günter Zöchbauer Oct 17 '19 at 05:17
How can I get the length of `ab`? – My Car Nov 07 '22 at 06:29
1

https://api.dart.dev/be/180360/dart-core/List/length.html `ab.length` – Günter Zöchbauer Nov 07 '22 at 08:53

score 5 · Answer 2 · edited Mar 15 '22 at 07:41

5

void main(){
     String listA = '["one", "two", "three", "four"]';
     var a = jsonDecode(listA);
     print(a[0]); // print one

     String listB = 'one,two,three,four';
     var b = (listB.split(','));
     print(b[0]); // print one
}

edited Mar 15 '22 at 07:41

Dave

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answered Mar 11 '22 at 14:27

Ahmed Raafat

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Flutter how to convert String to List

2 Answers2

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