flutter Sorting list of map-CodePudding

so i want to make rating box like the image below, but for the rating value it hasn't been sorted yet, plus it's not int/double but string. What code is suitable for this ?

i want it to result High rating 5 to lowest 1

i will be glad if you give some example code

don't mind the linear progress bar

json data

"all_rating": [
                {
                    "rating": "1",
                },
                {
                    "rating": "2",
                },
                {
                    "rating": "4",
                },
                {
                    "rating": "4.5",               
                },
                {
                    "rating": "5",
                }
            ],

CodePudding user response：

You can use double.parse(<any string containing double>) to convert string to double and then sort them like below.

// this is list of double that you got from map.
List<double> doubleList = [1,0.5,4,3,2];

// sort the list using sort function.
doubleList.sort();

CodePudding user response：

Use double.parse(<any string containing double>) to convert string to double and then sort accordingly.

To sort, custom compare to function needs to be given

list.sort((a, b) => a.rating.compareTo(b.rating));

CodePudding user response：

I think this sorting system helps you to get your solution.

List<Map> allRating = [
                {
                    "rating": "1",
                },
                {
                    "rating": "2",
                },
                {
                    "rating": "4",
                },
                {
                    "rating": "4.5",               
                },
                {
                    "rating": "5",
                }
            ];
  
allRating.sort((a, b) => (b['rating']).compareTo(a['rating'])); /// sort List<Map<String,dynamic>>

print(allRating);  /// output -> [{rating: 5}, {rating: 4.5}, {rating: 4}, {rating: 2}, {rating: 1}]