如何在变量调用中插入For循环变量

问题描述

    class GraphData {
    List <double> closingPricesBTC = [];
    List <double> closingPricesETH = [];
    List <double> closingPricesLTC = [];

        for (String cryptoCurrency in cryptoAbbreviation){
        .
        . (some code)
        .
        double closePrice = ....

        closingPrices.add(closePrice);
        }

}

cryptoAbreviation的缩写

const List<String> cryptoAbbreviation = ['BTC','ETH','LTC'];

如何将当前的“ cryptocurrency”字符串附加到closingPrices.add(closePrice)的变量名称中，以便以closingPricesBTC.add(closePrice)，closingPricesETH.add(closePrice)和closingPricesLTC.add(closePrice)结尾

我尝试过closingPrices$cryptoCurrency.add(closePrice);，但这没用。

解决方法

您不能生成变量名，但是可以尝试HashMap（Java）/ Map（Dart）。这应该满足您的要求。

Map<String,List<double>> closingPrices = {'BTC':[],'ETH':[],'LTC':[]};


        for (String cryptoCurrency in cryptoAbbreviation){
        .
        . (some code)
        .
        double closePrice = ....

        closingPrices[cryptoCurrency].add(closePrice);
        }