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oodavid/main.dart

Created January 22, 2020 17:17
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  1. oodavid created this gist Jan 22, 2020.
    28 changes: 28 additions & 0 deletions main.dart
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,28 @@
    extension SortBy on List {
    sortBy(List<String> keys) {
    this.sort((a, b) {
    for(int k=0; k<keys.length; k++) {
    String key = keys[k];
    int comparison = Comparable.compare((a[key]??""), (b[key]??""));
    if(comparison != 0){
    return comparison;
    }
    }
    return 0;
    });
    }
    }

    void main() {
    List<Map> items = [
    {'building': 'Main Building', 'room': 'Lounge'},
    {'building': 'Another Building', 'room': 'Study'},
    {'building': 'Main Building', 'room': 'Kitchen'},
    {'building': 'Main Building'},
    {'building': 'Another Building', 'room': 'Kitchen'},
    ];
    print(items);
    print('----');
    items.sortBy(['building', 'room']);
    print(items);
    }