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Json - create an ID column that auto increment

I'm building a json object from 2 dataset and I need to add a column (ID) with a unique value,
I have thought that having an auto increment ID (1,2,3,4..) value will be great
This is how I'm building my Json object with JavaScript
var output = [];
for (var rowIdx = 0; rowIdx < csv.length; rowIdx++) {
var row = {};
for (var fieldIdx =0; fieldIdx < fields.length; fieldIdx++) {
var field = editor.field( fields[fieldIdx] );
var mapped = data[ field.name() ];
row[field.name()] = csv[rowIdx][mapped];
}
output.push(row);
}
var json = JSON.stringify(output);
console.log(json)
and this is my JSON: PLEASE NOTE: I want to add "id": "1" column whose value will auto increment for each record
[
{
"id": "1", <--- DESIRED
"title": "Hello World",
"artist": "John Smith",
"genre": "pop",
"week": "4",
"highest_rating": "3",
"year": "2014",
"youtube": "www"
]
},
{
"id": "2", <--- DESIRED
"title": "Lorem Ipsum",
"artist": "John Smith",
"genre": "pop",
"week": "4",
"highest_rating": "3",
"year": "2014",
"youtube": "www"
]
}
]

you can do this row.id = (rowIdx + 1);
var output = [];
for (var rowIdx = 0; rowIdx < csv.length; rowIdx++) {
var row = {};
for (var fieldIdx = 0; fieldIdx < fields.length; fieldIdx++) {
var field = editor.field(fields[fieldIdx]);
var mapped = data[field.name()];
row[field.name()] = csv[rowIdx][mapped];
}
row.id = (rowIdx + 1); // <--- this line
output.push(row);
}
var json = JSON.stringify(output);
console.log(json);

You can increment an i number starting from 0, for Id of each object in the output array. For example:
for(let i=0; i<output.length; i++)
{ output[i].id=i+1;}

How to create a nested object from data using JavaScript?

Before
This is an object with multiple rows:
{
"functions": [
{
"package_id": "2",
"module_id": "2",
"data_id": "2"
},
{
"package_id": "1",
"module_id": "1",
"data_id": "2"
},
{
"package_id": "2",
"module_id": "3",
"data_id": "3"
}
]
}
Desired result
I want this to return into a "nested" Object like below, without duplicates:
{
"packages": [
{
"package_id": "2",
"modules": [
{
"module_id": "2",
"data": [
{
"data_id": "2"
}
]
},
{
"module_id": "3",
"data": [
{
"data_id": "3"
}
]
}
]
},{
"package_id": "1",
"modules": [
{
"module_id": "1",
"data": [
{
"data_id": "2"
}
]
}
]
}
]
}
I've already tried loops inside loops, with constructing multiple arrays and objects. Which causes duplicates or overriding objects into single ones. Is there a more generic way to generate this with JavaScript? (It's for an Angular (6) project.
Example 1
getFunctionPackage() {
var fList = this.functionList;
var dArr = [];
var dObj = {};
var pArr = [];
var pObj = {};
var mArr = [];
var mObj = {};
for (var key in fList) {
pObj['package_id'] = fList[key]['package_id'];
mObj['module_id'] = fList[key]['module_id'];
dObj['data_id'] = fList[key]['data_id'];
for (var i = 0; i < pArr.length; i++) {
if (pArr[i].package_id != pObj['package_id']) {
pArr.push(pObj);
}
for (var x = 0; x < mArr.length; x++) {
if (pArr[i]['modules'][x].module_id != mObj['module_id']) {
mArr.push(mObj);
}
for (var y = 0; y < dArr.length; y++) {
if (pArr[i]['modules'][x]['datas'][y].data_id != dObj['data_id']) {
dArr.push(dObj);
}
}
}
}
if (dArr.length == 0) {
dArr.push(dObj);
}
mObj['datas'] = dArr;
if (mArr.length == 0) {
mArr.push(mObj);
}
pObj['modules'] = mArr;
if (pArr.length == 0) {
pArr.push(pObj);
}
dObj = {};
mObj = {};
pObj = {};
}
}
Example 2:
Results in skipping cause of the booleans
var fList = this.functionList;
var dArr = [];
var dObj = {};
var pArr = [];
var pObj = {};
var mArr = [];
var mObj = {};
var rObj = {};
for (var key in fList) {
pObj['package_id'] = fList[key]['package_id'];
mObj['module_id'] = fList[key]['module_id'];
dObj['data_id'] = fList[key]['data_id'];
var pfound = false;
var mfound = false;
var dfound = false;
for (var i = 0; i < pArr.length; i++) {
if (pArr[i].package_id == pObj['package_id']) {
for (var x = 0; x < mArr.length; x++) {
if (pArr[i]['modules'][x].module_id == mObj['module_id']) {
for (var y = 0; y < dArr.length; y++) {
if (pArr[i]['modules'][x]['datas'][y].data_id == dObj['data_id']) {
dfound = true;
break;
}
}
mfound = true;
break;
}
}
pfound = true;
break;
}
}
if (!dfound) {
dArr.push(dObj);
mObj['datas'] = dArr;
dObj = {};
}
if (!mfound) {
mArr.push(mObj);
pObj['modules'] = mArr;
mObj = {};
}
if (!pfound) {
pArr.push(pObj);
pObj = {};
}
dArr = [];
mArr = [];
}
rObj['packages'] = pArr;
console.log(rObj);

Here's a more generic approach using Array#reduce() to create a grouped object based on the package id as keys. You can use any loop to build this same object ...for() or forEach() for example.
Then use Object.values() to get the final array from that grouped object
Using methods like Array#find() simplifies traversing to see if a module exists already or not within each package
const grouped = data.functions.reduce((a, c )=>{
// if group object doesn't exist - create it or use existing one
a[c.package_id] = a[c.package_id] || {package_id : c.package_id, modules: [] }
// store reference to the group modules array
const mods = a[c.package_id].modules
// look within that group modules array to see if module object exists
let module = mods.find(mod => mod.module_id === c.module_id)
if(!module){
// or create new module object
module = {module_id: c.module_id, data:[]}
// and push it into modules array
mods.push(module);
}
// push new data object to module data array
module.data.push({data_id: c.data_id})
return a
}, {})
// create final results object
const res = { packages : Object.values(grouped) }
console.log(res)
.as-console-wrapper {max-height: 100%!important;}
<script>
const data = {
"functions": [{
"package_id": "2",
"module_id": "2",
"data_id": "2"
},
{
"package_id": "1",
"module_id": "1",
"data_id": "2"
},
{
"package_id": "2",
"module_id": "3",
"data_id": "3"
}
]
}
</script>

How to solve this without using three nested for loops

I have an array of objects something like this
var data = [{"2017-09-13":{date_time:"2017-09-13",value:"20"}},{"2017-09-13":{date_time:"2017-09-13",value:"22"}},{"2017-09-15":{date_time:"2017-09-15",value:"25"}},{"2017-09-15":{date_time:"2017-09-15",value:"30"}},{"2017-09-16":{date_time:"2017-09-16",value:"10"}}];
I have an array of dates like this
var dates = ["2017-09-13","2017-09-15"];
I want to modify the data array in such a way that it only contains the days mentioned in the dates array. I have tried something like this
var date = [];
for (var i = 0; i < data.length; i++) {
for (var j = 0; j < dates.length; j++) {
for (key in data[i]) {
if (dates[j] == key) {
date.push(data[i])
}
}
}
}
And it gives me the required result. However this is not efficient and is lagging the application. Is there any efficient way to go about it?
EDIT: Updated the correct data structure

const data = [
{
"2017-09-13": {
"date_time": "2017-09-13",
"value": "20"
}
},
{
"2017-09-13": {
"date_time": "2017-09-13",
"value": "22"
}
},
{
"2017-09-15": {
"date_time": "2017-09-15",
"value": "25"
}
},
{
"2017-09-15": {
"date_time": "2017-09-15",
"value": "30"
}
},
{
"2017-09-16": {
"date_time": "2017-09-16",
"value": "10"
}
}
];
const dates = ["2017-09-13", "2017-09-15"];
const datesSet = new Set(dates);
const filteredData = data.filter(item => datesSet.has(Object.keys(item)[0]));
console.log(filteredData);
Consider removing the use of dates as keys, as they seem to be redundant information:
const data = [
{
"date_time": "2017-09-13",
"value": "20"
},
{
"date_time": "2017-09-13",
"value": "22"
},
{
"date_time": "2017-09-15",
"value": "25"
},
{
"date_time": "2017-09-15",
"value": "30"
},
{
"date_time": "2017-09-16",
"value": "10"
}
];
const dates = ["2017-09-13", "2017-09-15"];
const datesSet = new Set(dates);
const filteredData = data.filter(item => datesSet.has(item.date_time));
console.log(filteredData);

Your datastructure is ugly. You will always need two loops to iterate it. However, we could set up a more elegant datastructure ( aka a Map), which we can access more easily:
const days = new Map();
for(const obj of data){
for(day in obj){
if( days.has(day) ){
days.get(day).push( obj[day] );
} else {
days.set(day, [ obj[day] ]);
}
}
}
After the Map is created, you can simply do:
days.get("2017-09-13")
to get an array of objects with datetime/values. That can be iterated easily:
days.get("2017-09-13").forEach( ({value}) => {
console.log(value);
});
Or getting multiple dates:
const result = new Map(
dates.map(date => [date, days.get( date )] )
);
console.log( [...result] );
and data only:
const result = [];
dates.forEach(date => result.push(...days.get(date)));

Here is a solution with only two for loops.
var data = [{'2017-09-13':{date_time:"2017-09-13",value:"20"}},{'2017-09-13':{date_time:"2017-09-13",value:"22"}},{'2017-09-15':{date_time:"2017-09-15",value:"25"}},{'2017-09-15':{date_time:"2017-09-15",value:"30"}},{'2017-09-16':{date_time:"2017-09-16",value:"10"}}];
var date = [];
for (var i = 0; i < data.length; i++) {
for (key in data[i]) {
if (date.indexOf(key) === -1) {
date.push(key);
}
}
}
console.log(date);

var dataByDate = { };
for (var i = 0; i < data.length; i++) {
for (var j in data[i])
dataByDate[j] = dataByDate[j] || true;
}
Converts the data to
{ '2017-09-13': true, '2017-09-15': true, '2017-09-16': true }
Then you can do
for (var i in dataByDate) { ... }

Data manipulation in DataTables

I have a quite complex data manipulation to perform.
My datasource gives me a list of cashflows, grouped by person like that:
{
"months": [
"2016-10-01",
"2016-11-01",
"2016-12-01",
"2017-01-01"
],
"persons": [
{
"label": "John",
"cashflows": [
{
"date": "2016-10-01",
"amount": "1000.00"
},
{
"date": "2016-11-01",
"amount": "1000.00"
}
]
},
{
"label": "Brad",
"cashflows": [
{
"date": "2017-01-01",
"amount": "5540.00"
}
]
}
]
}
I want to put those data in a DataTable, but I don't know how to "JOIN" the months and the cashflows.
My best guest is a sql-like query, but in javascript, in order to perform this pseudo-code:
select each person
for each person
good_row = person.cashflows LEFT JOIN months ON cashflows.date (iiish..)
I have set up a jsfiddle here.

Here is the plain javascript way to do it (the hard way).
Fiddle link: https://jsfiddle.net/ngwqfjo0/
function getDesiredData() {
var persons = real_data["persons"];
var months = real_data["months"];
persons.forEach(function(person) {
var row = [];
var amounts = [];
row.push(person["label"]);
months.forEach(function(month) {
var amount = '';
for(x = 0; x < person["cashflows"].length; x++) {
if(month == person["cashflows"][x]["date"]) {
amount = person["cashflows"][x]["amount"];
break;
}
}
amounts.push(amount);
});
desiredData.push(row.concat(amounts));
});
return desiredData;
}
To make life easier, consider using a functional utility like lodash or underscore
function getDesiredDataEasy() {
var persons = real_data["persons"];
var months = real_data["months"];
var desiredData = [];
return _.map(persons, function(person) {
return _.concat([person["label"]], _.map(months, function(month) {
var cashFlowDate = _.find(person["cashflows"], function(cf) {
return cf.date == month;
});
return cashFlowDate ? cashFlowDate.amount : "";
}));
});
}

JavaScript compare two arrays(key/value pairs) and copy value from one to the other if key matches

I have two arrays containing key/value pairs.
{
"containerOne": [{
"Id": 1,
"Title": "TitleOne",
"Responsibility": "ValueOne"
}, {
"Id": 2,
"Title": "TitleTwo",
"Responsibility": "ValueTwo"
}]
}
{
"containerTwo": [{
"Id": 1,
"Title": "TitleOne",
"Responsibility": null
}, {
"Id": 2,
"Title": "TitleTwo",
"Responsibility": "null
}
]
}
I'd like to compare both arrays and compare the title of each container. If the titles match, then I'd like to copy the Responsibility value from containerOne to containerTwo. The ID's will not match, so that can be ruled out. Only the titles will be consistent.
What is the most efficient way to do this please?]
Thanks
=====================================================================
EDIT
=====================================================================
Looking at the arrays a little closer, there is a subtle difference in the data being returned:
{
"AMLookupTasksList":
[
{
"Id":1,
"Title":"Create and Maintain an Onboarding Document",
"Responsibility":"1. Onboarding|f101ccf1-c7d5-42e7-ba8f-48e88ac90a3d"
},
{
"Id":2,
"Title":"Execute Onboarding for New Consultants",
"Responsibility":"1. Onboarding|f101ccf1-c7d5-42e7-ba8f-48e88ac90a3d"
}
]
}
{
"AMTasksList":
[
{
"Id":4,
"Title":
{
"$M_1":13,"$c_1":"Create and Maintain an Onboarding Document"
},
"Responsibility":null
},
{
"Id":17,
"Title":
{
"$M_1":12,"$c_1":"Execute Onboarding for New Consultants"
},
"Responsibility":null
}
]
}
Do I have additional looping to get to the Title value in the second array?

This might be a bit of overkill but it ignores the sequence and does a look up in each object.
I had to fix some syntax in your objects but I include that: named the objects and took a quote off one of the null values.
var obj1 = {
"containerOne": [{
"Id": 1,
"Title": "TitleOne",
"Responsibility": "ValueOne"
}, {
"Id": 2,
"Title": "TitleTwo",
"Responsibility": "ValueTwo"
}]
};
var obj2 = {
"containerTwo": [{
"Id": 1,
"Title": "TitleOne",
"Responsibility": null
}, {
"Id": 2,
"Title": "TitleTwo",
"Responsibility": null
}]
};
Now the code:
// lookup for first object:
var lookup = {};
// create referece to list above and use it everywhere
lookup.list = obj1;
for (var i = 0, len = lookup.list.containerOne.length; i < len; i++) {
lookup[lookup.list.containerOne[i].Title] = lookup.list.containerOne[i];
}
// lookup for second object
var otherLookup = {};
otherLookup.list = obj2;
for (var i = 0, len = otherLookup.list.containerTwo.length; i < len; i++) {
otherLookup[otherLookup.list.containerTwo[i].Title] = otherLookup.list.containerTwo[i];
}
// copy value for Responsibility from first to second on each matched in second.
var i = 0;
var len = lookup.list.containerOne.length;
for (i; i < len; i++) {
// looks up value from second list in the first one and if found, copies
if (lookup[otherLookup.list.containerTwo[i].Title]) {
otherLookup.list.containerTwo[i].Responsibility = lookup[otherLookup.list.containerTwo[i].Title].Responsibility;
}
}
// alerts new value using lookup
alert(otherLookup["TitleOne"].Responsibility);
EDIT for new structure, but same answer really:
var obj1 = {
"AMLookupTasksList": [{
"Id": 1,
"Title": "Create and Maintain an Onboarding Document",
"Responsibility": "1. Onboarding|f101ccf1-c7d5-42e7-ba8f-48e88ac90a3d"
}, {
"Id": 2,
"Title": "Execute Onboarding for New Consultants",
"Responsibility": "1. Onboarding|f101ccf1-c7d5-42e7-ba8f-48e88ac90a3d"
}]
};
var obj2 = {
"AMTasksList": [{
"Id": 4,
"Title": {
"$M_1": 13,
"$c_1": "Create and Maintain an Onboarding Document"
},
"Responsibility": null
}, {
"Id": 17,
"Title": {
"$M_1": 12,
"$c_1": "Execute Onboarding for New Consultants"
},
"Responsibility": null
}]
};
var lookup = {};
// create refernece to list above and use it everywhere
lookup.list = obj1;
for (var i = 0, len = lookup.list.AMLookupTasksList.length; i < len; i++) {
lookup[lookup.list.AMLookupTasksList[i].Title] = lookup.list.AMLookupTasksList[i];
}
var otherLookup = {};
otherLookup.list = obj2;
for (var i = 0, len = otherLookup.list.AMTasksList.length; i < len; i++) {
otherLookup[otherLookup.list.AMTasksList[i].Title.$c_1] = otherLookup.list.AMTasksList[i];
}
// copy value for Responsibility from first to second
var i = 0;
var len = otherLookup.list.AMTasksList.length;
for (i; i < len; i++) {
if (lookup[otherLookup.list.AMTasksList[i].Title.$c_1]) {
otherLookup.list.AMTasksList[i].Responsibility = lookup[otherLookup.list.AMTasksList[i].Title.$c_1].Responsibility;
}
}
alert(otherLookup["Create and Maintain an Onboarding Document"].Responsibility);
Fiddle for second answer: http://jsfiddle.net/n22V8/

First, create a dictionary from containerTwo:
var c2dict = {};
var c2i = containerTwo.innerContainer;
for (var i = 0; i < c2i.length; i++) {
c2dict[c2i[i].Title] = c2i[i];
}
Now use this to do the copying of propertyies when titles match:
var c1i = containerOne.innerContainer;
for (var i = 0; i < c1i.length; i++) {
if (c2dict[c1i[i].Title]) {
c2dict[c1i[i].Title].Property = c1i[i].Property;
}
}

You should compare properties and set them as the following:
containerOne.innerContainer.forEach(function (element,index) {
containerTwo.innerContainer.forEach(function (element2,index2) {
if (element.Title === element2.Title && element.Property != element2.Property) {
element2.Property = element.Property;
}
});
});