I want to convert a string to multi-level list, but I cannot find a efficient way to do.
From String: [[1,2,3],[1,2]]
To List: List< List < int>>
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You can checkout QuickType to parse your JSON string. It will generate the model for the required language.Shubham Gupta– Shubham Gupta2020-05-29 06:49:26 +00:00Commented May 29, 2020 at 6:49
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3 Answers
Try this as a funtion
List<List<int>> convert(String val){
List<List<int>> list = [];
jsonDecode(val).forEach((mainList) {
List<int> subList = [];
mainList.forEach((sList) {
subList.add(sList);
});
list.add(subList);
});
return list;
}
Also import dart:convert;
Comments
String str = '[[1,2,3],[1,2]]';
List<List<int>> list=[];
for(String s in str.split('],[')){
List<int> l = [];
String formattedString = s.replaceAll('[','').replaceAll(']','');
for(String innerS in formattedString.split(',')){
l.add(int.parse(innerS));
print(l);
}
list.add(l);
}
Output: [[1, 2, 3], [1, 2]]
Comments
Shorter version:
import 'dart:convert';
void main() {
var jsonMap = "[[1,2,3],[1,2]]";
List<List<int>> items = (jsonDecode(jsonMap) as List).map((lst) =>
(lst as List).map((i) => (i as int)).toList()).toList();
print(items);
}
