Develop Reference

JavaScript - Targeting an object value to create another variable

So I have an array which looks like this:
[
{ TransactionValues: '50.00' },
{ TransactionValues: '-77.43' },
{ TransactionValues: '-20.23' },
{ TransactionValues: '200.23' }
]
I am trying to find a way to target the monetary value and create a variable based on the sum of these. When I try to target the "50.00" for example I get "Undefined" and it's still an array.
I'm not exactly sure how I can target it specifically, is it possible? Any help would be appreciated
As per the comments here is the full code (be wary I'm still learning so it's not elegant):
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)

not completely following but at the end of the day you have an array like data below.
you can use filter to target the attribute you want.
you can use map to pull out just the values.
you can use reduce to sum them all up.
run the snippet below to see each step
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));

So I may have fixed it by using parseFloat in my addData and logTrans functions:
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);
}
};
Now that seems to of worked. So I can use the "Sum values of objects in array" as suggested before. Thank you everyone :)

Add elements from array to object to format fusionchart data

I want to format the data of my fusion chart based on scope variable.
I have a function which gets dates and stock values assigned to this dates.
So I have 2 arrays:
dates = [2017-04-28, 2017-04-27, 2017-04-26, 2017-04-25]
stockValues = [150.25, 147.7, 146.56, 146.49]
What I want to do is to create a new object which looks like this:
data: [{
"label": "2017-04-28",
"value": "150.25"
},
{
"label": "2017-04-27",
"value": "147.7"
},
... //and so on
]
I managed to come up with following code:
$scope.getStockData = function(stockID) {
$http.get('/stock', {
params : {
stockID : encodeURI(stockID)
}
}).then(function(response) {
$scope.stock = response.data;
var data={};
$scope.data={};
angular.forEach(response.data.dates,function(value){
data["label"] = value;
})
angular.forEach(response.data.stockValues,function(value){
data["value"] = value;
})
$scope.data = data;
}, function(response) {
$scope.showError = true;
}).finally(function() {
});
};
The problem is that this solution creates object which looks like this:
{"label":"2017-04-25","value":"146.49"}
So it takes only the last values from array.
How can I make my object look the way I want it to?

Example:
const dates = ['2017-04-28', '2017-04-27', '2017-04-26', '2017-04-25']
const stockValues = ['150.25', '147.7', '146.56', '146.49']
const r = dates.map((d, i) => Object.assign({
label: d,
value: stockValues[i]
}))
console.log(JSON.stringify(r, null, 2))

Try this, you must initialize an array, and the push at the right location.
$scope.getStockData = function(stockID) {
$http.get('/stock', {
params : {
stockID : encodeURI(stockID)
}
}).then(function(response) {
$scope.stock = response.data;
var data=[];
$scope.data=[];
angular.forEach(response.data.dates,function(value, i){
data[i]["label"] = value;
})
angular.forEach(response.data.stockValues,function(value, i){
data[i]["value"] = value;
})
$scope.data = data;
}, function(response) {
$scope.showError = true;
}).finally(function() {
});
};

Cannot read property 'concat' of undefined

to begin with, I have a multilevel of entities as in
country unit ----> customer reporting group ----> customers
each country unit has different customer reporting groups and each of the later has different customers
in the code the variable names are
cu ----> crg ---> customer
this is represented in a multilevel object called menuData:
menuData = {
cu1: {
CRG3: {
Customer1: {},
Customer5: {}
},
CRG7: {
Customer3: {},
Customer2: {},
Customer7: {}
}
},
cu4: {
CRG1: {
Customer2: {},
Customer4: {}
},
CRG3: {
Customer4: {}
}
}
};
what I wanted to do is to construct unique id for each level in a multilevel objects as well as in for example the ids for the customer units will be the same
cu1 and cu2 and so on
for the customer reporting groups the ids will consist of the cu + the crg as in
cu1+crg4
for the customer:
cu1+crg4+customer6;
what I did is a function called getIds
var getIds = function(menuData) {
var ids = {};
for (cu in menuData) {
ids[cu] = cu;
for (crg in menuData[cu]) {
if (!(ids[cu] in ids)) {
ids[cu] = {};
ids[cu][crg] = ids[cu].concat(crg);
} else ids[cu][crg] = ids[cu].concat(crg);
for (customer in menuData[cu][crg]) {
if (!ids[cu][crg]) {
ids[cu][crg] = {};
ids[cu][crg][customer] = ids[cu][crg].concat(customer);
} else ids[cu][crg][customer] = ids[cu][crg].concat(customer);
}
}
}
console.log(ids);
return ids;
};
the error I got is
Cannot read property 'concat' of undefined
what I have tried is that, because it says that it's undefined, I try to define it if its not already defined as in
if (!(ids[cu] in ids)) {
ids[cu] = {};
ids[cu][crg] = ids[cu].concat(crg);
}
if its not defined, define it and insert the value, but if its defined, only assign the value
else ids[cu][crg] = ids[cu].concat (crg );
why do I get this error? and how to get the the ids in multilevel objects ?
edit, excpected output is
ids = {
"cu1": {
"cu1+CRG3": { "cu1+CRG3+Customer1":{}, "cu1+CRG3+Customer5":{} },
"cu1+CRG7": { "cu1+CRG7+Customer3":{}, "cu1+CRG7+Customer2":{}, "cu1+CRG7+Customer7":{} }
},
"cu4": {
"cu4+CRG1": { "cu4+CRG1+Customer2":{}, "cu4+CRG1+Customer4":{} },
"cu4+CRG3": { "cu4+CRG3+Customer4":{}}
}
}

The Problem with your Code is that you are using Objects to store your data and Objects don´t have the Method "concat" only Arrays have the "concat" Method. Your Object must look like these to work:
menuData = [
"cu1": [
"CRG3": [ "Customer1":{}, "Customer5":{} ],
"CRG7": [ "Customer3":{}, "Customer2":{}, "Customer7":{} ]
],
"cu4": [
"CRG1": [ "Customer2":{}, "Customer4":{} ],
"CRG3": [ "Customer4":{}]
]
]
Here´s a reference : MDN Array.concat()
What can be confusing in JS is that an Object Property can be accessed like an Array.
Update after Expected Output was added:
okay than i think concat is not the right solution for your Problem.
Try it with something like this:
var ids = {};
var menuData = {
cu1: {
CRG3: {
Customer1: {},
Customer5: {}
},
CRG7: {
Customer3: {},
Customer2: {},
Customer7: {}
}
},
cu4: {
CRG1: {
Customer2: {},
Customer4: {}
},
CRG3: {
Customer4: {}
}
}
};
for (propKeyLevel1 in menuData){
ids[propKeyLevel1] = {};
var propLevel1 = ids[propKeyLevel1];
for(propKeyLevel2 in menuData[propKeyLevel1]){
propLevel1[propKeyLevel1+"+"+propKeyLevel2] = {};
var propLevel2 = propLevel1[propKeyLevel1+"+"+propKeyLevel2];
for(propKeyLevel3 in menuData[propKeyLevel1][propKeyLevel2]){
propLevel2[propKeyLevel1+"+"+propKeyLevel2+"+"+propKeyLevel3] = {};
}
}
}
console.log(ids);

concat is a method for for a String or an Array, here you call it on an object hence the error.
What you're trying to do is a bit unclear to me, but maybe you could try that :
ids[cu][crg] = crg;
instead of :
ids[cu][crg] = ids[cu].concat (crg );
Because that's what you seem to be trying.

I’d try it this way:
function getIds(dataIn, idsIn) {
idsIn = idsIn || [];
var dataOut = {}, idOut;
for (var idIn in dataIn) {
idsOut = idsIn.concat([idIn]);
dataOut[idsOut.join('+')] = getIds(dataIn[idIn], idsOut);
}
return dataOut;
}
Perfect use case for a recursive function passing down an array (idsOut) of the ids of the previous layers to generate the intended object keys. Pretty straight forward.

How to replace old json object with a new one with NodeJS

How to replace old json object using NodeJS with a new updated object ?
Right now when i update the json file it saves the new data with the old one.
JSON :
[ {
"id": 1,
"name": "Sven",
"phone": "123123"
},
{
"id": 2,
"name": "Martin",
"phone": "2342342"
} ]
Here is my code :
var operation = POST.operation; // POST request comes with operation = update/insert/delete
if (operation == 'update') {
fs.readFile("file.json", "utf8", function (err, data) {
var jsonFileArr = [];
jsonFileArr = JSON.parse(data); //Parse the data from JSON file
var haveId = jsonFileArr.some(function (obj){ // Checks if the POST request have the same id as JSON file
return obj.id == POST.id;
})
if (haveId) { // if true
var updateData = []; // Array with POST data
updateData.push({
id: POST.id,
name: POST.name,
phone: POST.phone,
})
jsonFileArr.push(updateData);
var newUsers = JSON.stringify(jsonFileArr);
fs.writeFile("file.json", newUsers, "utf8");
console.log(err);
}
})
}
I should probably use delete object but how can i specify what object should be removed ?
So when i update data with id 1 it would delete the old id / Name / phone and write the new data.

My assumption base on your question is that you have multiple objects in one file. So the easy way to work around this would be to
if (operation == 'update') {
fs.readFile("file.json", "utf8", function (err, data) {
var jsonFileArr = [];
jsonFileArr = JSON.parse(data); //Parse the data from JSON file
var haveId = jsonFileArr.some(function (obj){ // Checks if the POST request have the same id as JSON file
return obj.id == POST.id;
})
if (haveId) { // if true
var updateData = []; // Array with POST data
updateData.push({
id: POST.id,
name: POST.name,
phone: POST.phone,
})
for(let Arr of jsonFileArr){
if (Arr.id == POST.id){
let currentIndex = jsonFileArr.indexOf(Arr);
jsonFileArr.splice(currentIndex,1,updateData) //removing the old object and adding the new one
}
}
var newUsers = JSON.stringify(jsonFileArr);
fs.writeFile("file.json", '', "utf8",function(err,res){ //Making the file empty
if(!err){
fs.writeFile("file.json", newUsers, "utf8",function(err,res){ //Writing the whole object back
if(err)console.log(err);
console.info(res);
});
}else{
console.log(err);
}
});
}
})
}
I think this is better instead of using some, get the matching index and replace directly.
var jsonFileArr = JSON.parse(data); //Parse the data from JSON file
var foundId = jsonFileArr.findIndex(function (obj){ // Checks if the POST request have the same id as JSON file
return obj.id == POST.id;
});
if (foundId >= 0) {
jsonFileArr[foundId] =
{
id: POST.id,
name: POST.name,
phone: POST.phone,
}
}
.... and then write back to file

For Each loop ---> For loop

I am having a error that states that data.forEach is not a function. The code is:
function getProperGeojsonFormat(data) {
isoGeojson = {"type": "FeatureCollection", "features": []};
console.log("After getProperGeojsonFormat function")
console.log(data)
console.log("")
data.forEach(function(element, index) {
isoGeojson.features[index] = {};
isoGeojson.features[index].type = 'Feature';
isoGeojson.features[index].properties = element.properties;
isoGeojson.features[index].geometry = {};
isoGeojson.features[index].geometry.coordinates = [];
isoGeojson.features[index].geometry.type = 'MultiPolygon';
element.geometry.geometries.forEach(function(el) {
isoGeojson.features[index].geometry.coordinates.push(el.coordinates);
});
});
$rootScope.$broadcast('isochrones', {isoGeom: isoGeojson});
}
The error I am getting is:
When I console log data:

data is an object. It looks like you want to loop over the features array within that object, so do:
data.features.forEach(function(element, index) {
isoGeojson.features[index] = {
type: 'Feature',
properties: element.properties,
geometry: {
type: 'MultiPolygon',
coordinates: element.coordinates.slice()
}
}
});

forEach works on arrays, not on objects. It seems here that data is an object.
Use this instead.
Object.keys(data).forEach(function(index) {
var element = data[index];
isoGeojson.features[index] = {};
isoGeojson.features[index].type = 'Feature';
isoGeojson.features[index].properties = element.properties;
isoGeojson.features[index].geometry = {};
isoGeojson.features[index].geometry.coordinates = [];
isoGeojson.features[index].geometry.type = 'MultiPolygon';
element.geometry.geometries.forEach(function(el) {
isoGeojson.features[index].geometry.coordinates.push(el.coordinates);
});
});
Object.keys creates an array from the keys of an object. You can then iterate over these keys and fetch the associated value.
This approach will work on any objects.