how can i find same value in list dart?-CodePudding

i want to get StockModel which is code is "A006400" from below List.

 const allStocks = [
      StockModel(name: "대주주", code: "000000", count: 10000000),
      StockModel(name: "삼성SDI", code: "A006400", count: 5000),
      StockModel(name: "성일하이텍", code: "A365340", count: 300),
      StockModel(name: "일진머티리얼즈", code: "A020150", count: 10),
      StockModel(name: "하이트진로", code: "A000080", count: 1),
    ];

this is my function.

void setStock(String query) {
    StockModel stockModel = allStocks.where((stock){
      final stockCode = stock.code;
      if(stockCode == query) {
        return stock;
      }
    })

CodePudding user response：

You can do it like `

void setStock(String query) {
  StockModel stockModel = allStocks.firstWhere((s) => s.code == query);
}

To get multiple items

 final stockModels = allStocks
      .where(
        (element) => element.code == query,
      )
      .toList();

CodePudding user response：

Assuming the code field is unique across your objects, you can do:

void setStock(String query) {
   StockModel stockModel = allStocks.singleWhere((stock) => stock.code == query);
}

CodePudding user response：

To get ALL item, use where, dart executable example:

class StockModel {
  String? name;
  String? code;
  int? count;

  StockModel({this.name, this.code, this.count});
}

List<StockModel> allStocks = [
  StockModel(name: "대주주", code: "000000", count: 10000000),
  StockModel(name: "삼성SDI", code: "A006400", count: 5000),
  StockModel(name: "성일하이텍", code: "A365340", count: 300),
  StockModel(name: "일진머티리얼즈", code: "A020150", count: 10),
  StockModel(name: "하이트진로", code: "A000080", count: 1),
];

void setStock(String query) {
  List<StockModel> stockModel = allStocks.where((stock) {
    print(stock.code);
    if (stock.code == query) {
      return true;
    }
    return false;
  }).toList();

  print(stockModel.length.toString());
  print(stockModel[0].code.toString());
}

main() {
  setStock("A006400");
}