JavaScript

Question

所以我有一个如下所示的数组：

[
  { TransactionValues: '50.00' },
  { TransactionValues: '-77.43' },
  { TransactionValues: '-20.23' },
  { TransactionValues: '200.23' }
]

我正在尝试找到一种方法来确定货币价值并根据这些总和创建一个变量。例如，当我尝试定位“50.00”时，我得到“未定义”，它仍然是一个数组。

我不太确定如何专门针对它，可能吗？任何帮助将不胜感激

根据这里的评论是完整的代码（注意我还在学习所以它并不优雅）：

    var fs = require('fs');
var parse = require('csv-parse');


var transactionValues = []; //Need an array to hold transactions

var currentTrans = [];
var savingsTrans = [];

//constuctor for transactions
function addData (id, accountType, initiatorType, dateTime, transactions) {
  var data = {
    "AccountID" : id,
    "AccountType" : accountType,
    "InitiatorType" : initiatorType,
    "DateTime" : dateTime,
    "TransactionValues" : transactions
  }
  transactionValues.push(data); //should add a new line
}

function logTrans (accountType, transactions) {
  if (accountType == "CURRENT") {
    var cTrans = {
      "TransactionValues" : transactions
    }
    currentTrans.push(cTrans);
  }
  else {
    var sTrans = {
      "TransactionValues" : transactions
    }
      savingsTrans.push(sTrans);
    }
  };




//parses the csv file, loops each row and adds it to the transactionValue array
var parser = parse({columns: true}, function (err, results) {
console.table(results);
for (const row of results) {
addData(row.AccountID, row.AccountType, row.InitiatorType, row.DateTime, row.TransactionValue );
logTrans(row.AccountType, row.TransactionValue);
}
console.log(transactionValues);
console.log(currentTrans);
console.log(savingsTrans);
});

fs.createReadStream(__dirname+'/testData/customer-1234567-ledger.csv').pipe(parser)

Answer 1

所以我可能已经通过在我的 addData 和 logTrans 函数中使用 parseFloat 修复了它：

  function addData (id, accountType, initiatorType, dateTime, transactions) {
  var data = {
    "AccountID" : id,
    "AccountType" : accountType,
    "InitiatorType" : initiatorType,
    "DateTime" : dateTime,
    "TransactionValues" : parseFloat(transactions)
  }
  transactionValues.push(data); //should add a new line
}



  function logTrans (accountType, transactions) {
  if (accountType == "CURRENT") {
    var cTrans = parseFloat(transactions);
    currentTrans.push(cTrans);
  }
  else {
    var sTrans = parseFloat(transactions);
      savingsTrans.push(sTrans);
    }
  };

现在这似乎奏效了。所以我可以按照之前的建议使用“数组中对象的总和值”。谢谢大家:)

Answer 2

不完全遵循，但在一天结束时，您有一个类似下面数据的数组。

您可以使用过滤器来定位您想要的属性。您可以使用 map 仅提取值。你可以使用 reduce 来总结它们。

运行下面的代码片段可以查看每个步骤

const data = [
  { TransactionValues: '50.00', AccountType: 'CURRENT' },
  { TransactionValues: '-77.43', AccountType: null},
  { TransactionValues: '-20.23',  AccountType: 'CURRENT' },
  { TransactionValues: '200.23', AccountType: null }
];

const CurrentTrans = data.filter((x) => x.AccountType === 'CURRENT');
const SavingTrans = data.filter((x) => x.AccountType !== 'CURRENT');

console.log('CurrentTrans');
console.log(CurrentTrans);
console.log('SavingTrans');
console.log(SavingTrans);

const CurrentTransValues = CurrentTrans.map((x) => parseFloat(x.TransactionValues));
const SavingTransValues = SavingTrans.map((x) => parseFloat(x.TransactionValues));

console.log('CurrentTransValues');
console.log(CurrentTransValues);
console.log('SavingTransValues');
console.log(SavingTransValues);

const TotalCurrentValues = CurrentTransValues.reduce((sum, x) => sum + x);
const TotalSavingValues = SavingTransValues.reduce((sum, x) => sum + x);

console.log('TotalCurrentValues');
console.log(TotalCurrentValues.toFixed(2));
console.log('TotalSavingValues');
console.log(TotalSavingValues.toFixed(2));

JavaScript - 以对象值为目标创建另一个变量

JavaScript - Targeting an object value to create another variable

arrays

var