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milomai/map_list_with_index.dart

Last active December 30, 2020 09:37
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[Dart] Map list with index
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map_list_with_index.dart
List<int> list = [1, 2, 3];
List<String> result = list.asMap().entries.map((entry) {
int idx = entry.key;
int val = entry.value;
return "$idx: $val";
}).toList();
// or
List<String> result = list
.asMap()
.map((index, num) => MapEntry(index, "$index: $num"))
.values
.toList();
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milomai commented Nov 19, 2020

ref: https://fireship.io/snippets/dart-how-to-get-the-index-on-array-loop-map/

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milomai commented Dec 16, 2020

asMap() will keep the outter map's keys in numerical order, so the values will also follow this order.
Don't worry about the returnd list order.
ref: https://api.dart.dev/stable/dart-core/List/asMap.html

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