Question 77808 in Flutter Question posted in
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Flutter convert a list of maps into a single map

I have a list of maps in flutter with each map having only 2 keys. I would like convert them into a single map where the first key is a key and the second key becomes the value.

This is the list of maps

List results = [[
  { key: shortcuts_cart_createCart, value: 0 },
  { key: shortcuts_cart_discountCartTotal, value: 0 },
  { key: shortcuts_selling_cart, value: 0 },
]

I would like to convert the list to this map

Map shorts = {
      shortcuts_selling_cart : 0,
      shortcuts_cart_createCart : 0,
      shortcuts_cart_discountCartTotal : 0
}

How do I achieve that

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3

Answers


  1. 0

    you can try this

     List results = [
{ "key": "shortcuts_cart_createCart", "value": 0 },
{ "key": "shortcuts_cart_discountCartTotal", "value": 0 },
{ "key": "shortcuts_selling_cart", "value": 0 },
];

var map={};

 results.forEach((element){
map[element["key"]]=element["value"];
 });

 print(map);
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  2. 0

    I’d use MapEntry.

    Map.fromEntries(results.map(
  (innerMap) => MapEntry(innerMap['key'], innerMap['value']),
));

    Also note that your code is not syntactically valid. In Dart, you have to always quote strings, even if they are keys in a map, check the documentation.

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  3. 0

    You can use Map.fromIterable and do it by one line:

    var result = Map.fromIterable(l, key: (v) => v[0], value: (v) => v[1]);

    but romIterable has very weak typing. So collection-for is the only recommended way which is:

    var result = { for (var v in l) v[0]: v[1] };
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