flutter how to remove specific values inside List

Question

I have an List like this

List<MapEntry> _list = [
    MapEntry('a': []), 
    MapEntry('b': [Instance, Instance]), 
    MapEntry('c': [Instance]), 
    MapEntry('d': []), 
    MapEntry('e': [Instance, Instance]),
    MapEntry('f': []),
]

I need to make the

List<MapEntry> = [
        MapEntry('b': [Instance, Instance]), 
        MapEntry('c': [Instance]),
        MapEntry('e': [Instance, Instance]),
]

i was keep trying to use map methods but wasn't able to remove empty arrays inside the MapEntries value

what should I have to try?

try removeWhere

无夜之星辰
– 无夜之星辰

2022-09-29 01:46:13 +00:00
Commented Sep 29, 2022 at 1:46 — 无夜之星辰
– 无夜之星辰, Commented Sep 29, 2022 at 1:46

pmatatias · Accepted Answer · 2022-09-29 01:35:23Z

1

how about this:

void main() {
  List<MapEntry> _list = [
    MapEntry('a', []),
    MapEntry('b', ['Instance', 'Instance']),
    MapEntry('c', ['Instance']),
    MapEntry('d', []),
    MapEntry('e', ['Instance', 'Instance']),
    MapEntry('f', [])
  ];
  
  final ist = _list.where((e)=>(e.value as List).length>0).toList();
  
  print(ist);
// result:
// [MapEntry(b: [Instance, Instance]), MapEntry(c: [Instance]), MapEntry(e: [Instance, Instance])]
}

answered Sep 29, 2022 at 1:35

pmatatias

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