Question 78728 in Flutter Question posted in
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I want to reverse the key and value of Map – Flutter

How can I reverse the key and value of the map?

for example, {1:a , 2:b , 3:c} => {a:1 ,b:2 ,c:3}

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2

Answers


  1. 0

    You can do this:

    const items = {1:'a' , 2:'b' , 3:'c'};

void main() {
  final inverted = items.map((key, value) => MapEntry(value, key));
  print(inverted);
}

    It logs

    {a: 1, b: 2, c: 3}
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  2. 0

    Try this piece of code:

    Map<int, String> map = {1: "a", 2: "b", 3: "c"};

  Iterable<String> values = map.values;
  Iterable<int> keys = map.keys;
  Map<String, int> reversedMap = Map.fromIterables(values, keys);

  print(reversedMap); // {a:1 ,b:2 ,c:3}
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