I want to create a new array based on an original array but with merged data.
Every name key need to have merged date+time (format: YYYY-MM-DD HH:MM) with merged scores. All unique datetimes need to be available as key for each name.
ARRAY ORIGINAL:
"data": [{
"name": "A",
"history": [{
"created": "2017-05-16 00:00:00",
"score": "1"
},
{
"created": "2017-05-16 00:01:10",
"score": "1"
},
{
"created": "2017-05-16 00:01:30",
"score": "1"
}
]
},
{
"name": "B",
"history": [{
"created": "2017-05-16 00:01:00",
"score": "1"
}]
}
]
ARRAY THAT I WANT:
{
[A]: {
"2017-05-16 00:00": 1,
"2017-05-16 00:01": 2
},
[B]: {
"2017-05-16 00:00": 0,
"2017-05-16 00:01": 1
}
}
I hope you guys can help me out. I can't even think of an efficiënt way to do this, unfortunately. I tried to solve this issue with 5 foreach statements with no luck :(
You could use two arrays for names and times as closure and generate for all names and times a property with zero value.
var data = { data: [{ name: "A", history: [{ created: "2017-05-16 00:00:00", score: "1" }, { created: "2017-05-16 00:01:10", score: "1" }, { created: "2017-05-16 00:01:30", score: "1" }] }, { name: "B", history: [{ created: "2017-05-16 00:01:00", score: "1" }] }] },
result = data.data.reduce(function (names, times) {
return function (r, a) {
if (!r[a.name]) {
r[a.name] = {};
times.forEach(function (time) {
r[a.name][time] = 0;
});
names.push(a.name);
}
a.history.forEach(function (o) {
var time = o.created.slice(0, 16);
if (times.indexOf(time) === -1) {
names.forEach(function (name) {
r[name][time] = 0;
});
times.push(time);
}
r[a.name][time] += +o.score;
});
return r;
};
}([], []), {});
console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }
You have to create an object not an array, As arrays cannot have a key-value pair in javascript. There is no associative array concept in javascript. You have to use objects in javascript for that.
Here is how you can do what you are trying to achieve using objects.
value = {
"data": [{
"name": "A",
"history": [{
"created": "2017-05-16 00:00:00",
"score": "1"
},
{
"created": "2017-05-16 00:01:10",
"score": "1"
},
{
"created": "2017-05-16 00:01:30",
"score": "1"
}
]},
{
"name": "B",
"history": [{
"created": "2017-05-16 00:01:00",
"score": "1"
}]
}]
};
var result ={};
value.data.forEach(function(v){
var score = {};
for(var i=0;i<v.history.length;i++){
score[v.history[i].created] = v.history[i].score;
}
result[v.name] = score;
});
console.log(result);
Now you can access data as result.A or result[A] and result.B or result[B]
SNIPPET
value = {
"data": [{
"name": "A",
"history": [{
"created": "2017-05-16 00:00:00",
"score": "1"
},
{
"created": "2017-05-16 00:01:10",
"score": "1"
},
{
"created": "2017-05-16 00:01:30",
"score": "1"
}
]
},
{
"name": "B",
"history": [{
"created": "2017-05-16 00:01:00",
"score": "1"
}]
}
]
};
var result = {};
value.data.forEach(function(v) {
var score = {};
for (var i = 0; i < v.history.length; i++) {
score[v.history[i].created] = v.history[i].score;
}
result[v.name] = score;
});
console.log(result);
Related
Hi I am getting data from API but I want my data in different format so that I can pass later into a function. I want to change the names of keys into a different one becasuse I have created a chart and it only draws if I send it data in certain way
This is what I am getting from API
data = {
"status": "success",
"from": "DB",
"indice": "KSE100",
"data": [
{
"stock_sector_name": "Tc",
"sector_score": "0828",
"stocks": [
{
"stock_symbol": "TRG",
"stock_score": 44
},
{
"stock_symbol": "SYS",
"stock_score": 33
}
]
},
{
"stock_sector_name": "OIL",
"sector_score": "0828",
"stocks": [
{
"stock_symbol": "FFS",
"stock_score": 44
},
{
"stock_symbol": "SMS",
"stock_score": 33
}
]
},
]
}
But I want my data to look like this like this
data = {
"name": "KSE100",
"children": [
{
"name": "A",
'points': -9,
"children": [
{
"stock_title": "A",
"value": 12,
},
{
"stock_title": "B",
"value": 4,
},
]
},
{
"name": "B",
'points': 20,
"children": [
{
"stock_title": "A",
"value": 12,
},
{
"name": "B",
"value": 4,
},
]
},
]
}
Like I want to replace
stock_sector_name = name
sector_score = value
stocks = children
stock_symbol = name
stock_score = value
I have been trying this for so much time but sill could not figured it out
function convert(d){
return {
name : d.indice,
children : d.data.map(y=>{
return {
name : y.stock_sector_name,
points : y.sector_score,
children : y.stocks.map(z=>{
return {
stock_title: z.stock_symbol,
value : z.stock_score
}
})
}
})
}
}
You can do something like this
const data = {
"status": "success",
"from": "DB",
"indice": "KSE100",
"data": [{
"stock_sector_name": "Tc",
"sector_score": "0828",
"stocks": [{
"stock_symbol": "TRG",
"stock_score": 44
},
{
"stock_symbol": "SYS",
"stock_score": 33
}
]
},
{
"stock_sector_name": "OIL",
"sector_score": "0828",
"stocks": [{
"stock_symbol": "FFS",
"stock_score": 44
},
{
"stock_symbol": "SMS",
"stock_score": 33
}
]
},
]
}
const data2 = {
"name": "KSE100",
"children": [{
"name": "A",
'points': -9,
"children": [{
"stock_title": "A",
"value": 12,
},
{
"stock_title": "B",
"value": 4,
},
]
},
{
"name": "B",
'points': 20,
"children": [{
"stock_title": "A",
"value": 12,
},
{
"name": "B",
"value": 4,
},
]
},
]
}
//stock_sector_name = name
//sector_score = value
//stocks = children
//stock_symbol = stock_title
//stock_score = value
const keys = {
stock_sector_name: "name",
sector_score: "points",
stocks: "children",
stock_symbol: "stock_title",
stock_score: "value",
indice: "name",
//data: "children"
}
const rename = (value) => {
if (!value || typeof value !== 'object') return value;
if (Array.isArray(value)) return value.map(rename);
return Object.fromEntries(Object
.entries(value)
.map(([k, v]) => [keys[k] || k, rename(v)])
);
}
renamedObj = rename(data);
console.log(renamedObj);
I have an array like this:
[
{
"costs": [{
"value": "80"
}],
"id": 4,
"name": "Subscription Fee",
"month": "March"
},
[
{
"costs": [{
"value": "200"
}],
"id": 2,
"name": "Tution",
"month": "March"
},
{
"costs": [{
"value": "10"
}],
"id": 11,
"name": "DEMO"
}
]
]
I need to have sumation of all the values from costs. How can i do that?
const data = [
{"costs":[{"value":"80"}],"id":4,"name":"Subscription Fee","month":"March"},
[
{"costs":[{"value":"200"}],"id":2,"name":"Tution","month":"March"},
{"costs":[{"value":"10"}],"id":11,"name":"DEMO"}
]
];
// flatten the arrays to get a list of objects
// iterate over this list
const res = data.flat().reduce((total, { costs = [] }) => {
// add the values of this item's costs with total
costs.forEach(({ value = 0 }) => total += +value);
return total;
}, 0);
console.log(res);
I am working in small react project & I am facing issue in grouping the data. Requirement is to group the id & its feature into a single row if same id is there in before & after object.
Json Data:
{
"before":{
"device": [
{
id:"1234",
price:"10,
features:[
{name:"samsung",price:"10"},
{name:"Apple",price:"20"}
]
},
{id:"2154",
price:"20,
features:[
{name:"samsung",price:"30"},
{name:"Moto",price:"40"}
]
]
},
"after":{
"device": [
{
id:"1234",
price:"50,
features:[
{name:"samsung",price:"20"},
{name:"Lenovo",price:"30"}
]
},
{id:"2158",
price:"40,
features:[
{name:"samsung",price:"30"}
]
]
}
}
Expected grouping to be shown in UI is shared in image.
I tried to get unique ids in one array and lopping through after array and comparing unique array id I am getting unique id to show but issue i am facing while grouping their related feature.
Can anyone please help me to get a best approach to handle this requirement.
Thanks
There are 3 things i'd suggest you:
1.) Please verify the data your'e posting is correct and in proper format, people won't be able to help if the data is incorrect.
2.) The UI display requirement should be simple enough.
Now, if you still want to achieve this requirement i believe the correct JSON and the merged output json will look something like below:
//Correct input data that you have:
var input = {
"before": {
"device": [
{
"id": "1234",
"price": "10",
"features": [
{
"name": "samsung",
"price": "10"
},
{
"name": "Apple",
"price": "20"
}
]
},
{
"id": "2154",
"price": "20",
"features": [
{
"name": "samsung",
"price": "30"
},
{
"name": "Moto",
"price": "40"
}
]
}
]
},
"after": {
"device": [
{
"id": "1234",
"price": "50",
"features": [
{
"name": "samsung",
"price": "20"
},
{
"name": "Lenovo",
"price": "30"
}
]
},
{
"id": "2158",
"price": "40",
"features": [
{
"name": "samsung",
"price": "30"
}
]
}
]
}
};
// Output JSON which you should need to show the desired output.
var output = {
"devices": [
{
"id": 1234,
"feature": [
{
"name": "1234",
"price": {
"before": 10,
"after": 50
}
},
{
"name": "samsung",
"price": {
"before": 10,
"after": 20
}
},
{
"name": "apple",
"price": {
"before": 10,
"after": 0
}
},
{
"name": "lenovo",
"price": {
"before": 0,
"after": 30
}
}
]
}
]
};
3.) Please try to get the desired output from input yourself as this will help you learn a lot of things in between, as suggested by some please use map, filter, forEach for your requirement.
Hope this helps. Thanks!
You could take a nested approach for grouping.
var data = { before: { device: [{ id: "1234", price: "10", features: [{ name: "samsung", price: "10" }, { name: "Apple", price: "20" }] }, { id: "2154", price: "20", features: [{ name: "samsung", price: "30" }, { name: "Moto", price: "40" }] }] }, after: { device: [{ id: "1234", price: "50", features: [{ name: "samsung", price: "20" }, { name: "Lenovo", price: "30" }] }, { id: "2158", price: "40", features: [{ name: "samsung", price: "30" }] }] } },
cols = Object.fromEntries(Object.keys(data).map(k => [k, 0])),
result = Object.values(Object.entries(data).reduce((r, [col, { device }]) => {
device.forEach(({ id, price, features }) => {
r[id] = r[id] || [{ id, ...cols }];
r[id][0][col] = price;
features.forEach(({ name, price }) => {
let temp = r[id].find(q => q.name === name);
if (!temp) r[id].push(temp = { name, ...cols });
temp[col] = price;
});
});
return r;
}, {}));
console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }
You can use lodash library for grouping
https://lodash.com/docs/3.10.1#groupBy
Comparing 2 objects, and output equivalent values
var has = {"before":[{
name: 'Nokia',
os: 'Andriod',
features: {
camera: "200 MPixel Camera",
battery: "24 hours battery backup",
}
}],
"after":[{
name: 'Samsung',
os: 'Andriod',
features: {
camera: "200 MPixel Camera",
battery: "30 hours battery backup",
}
}]
};
function compare(Pro1, Pro2) {
var Val1 = Object.values(Pro1);
var Val2 = Object.values(Pro2);
var equivalent = [];
var keys = Object.keys(Pro1);
keys.forEach(k => {
if (Pro1.hasOwnProperty(k) && Pro2.hasOwnProperty(k)) {
if (typeof Pro1[k] === 'object') {
let recursiveResult = compare(Pro1[k], Pro2[k]);
equivalent.push(...recursiveResult);
} else if (Pro1[k] === Pro2[k]) {
equivalent.push(Pro1[k]);
}
}
});
return equivalent;
}
let equiv = compare(has["before"], has["after"]);
console.log(equiv);
I am reading a simple data set from a data.txt file. I would like to take this data and transform it into a specific object as per my example below. I have managed to get it into a somewhat usable JSON object but this is not ideal. I have included an example of the desired object.
Here is my app.js file:
let output = fs.readFileSync('./data.txt', 'UTF8')
.trim()
.split('\r\n')
.map((line) => line.split(';'))
.reduce((customers, line) => {
customers.push({
name: line[0],
product: [{
item: line[1],
serial: line[2],
year: line[3]
}]
})
return customers
}, [])
console.log(JSON.stringify(output, null, 2))
This currently the above NodeJs code returns the following array object:
[
{
"name": "Nancy",
"product": [
{
"item": "Macbook Pro",
"serial": "A34D05980FCD4303",
"year": "2019"
}
]
},
{
"name": "Nancy",
"product": [
{
"item": "iPad",
"serial": "O0403X3028423C92",
"year": "2015"
}
]
},
{
"name": "Nancy",
"product": [
{
"item": "iPhone",
"serial": "X3830238S3309230",
"year": "2017"
}
]
},
{
"name": "John",
"product": [
{
"item": "Macbook Pro",
"serial": "X2020J393983H380",
"year": "2013"
}
]
},
{
"name": "John",
"product": [
{
"item": "iPhone",
"serial": "X38320093X032309",
"year": "2015"
}
]
},
{
"name": "fluffikins",
"product": [
{
"item": "iMac",
"serial": "F392D392033X3232",
"year": "2013"
}
]
},
{
"name": "fluffikins",
"product": [
{
"item": "iPad",
"serial": "FE322230D3223S21",
"year": "2011"
}
]
}
]
What I am trying to do is get the below object returned - ideally still following the same functional approach:
[
{
"name": "Nancy",
"product": [
{
"item": "Macbook Pro",
"serial": "A34D05980FCD4303",
"year": "2019"
},
{
"item": "iPad",
"serial": "O0403X3028423C92",
"year": "2015"
},
{
"item": "iPhone",
"serial": "X3830238S3309230",
"year": "2017"
}
]
},
{
"name": "John",
"product": [
{
"item": "Macbook Pro",
"serial": "X2020J393983H380",
"year": "2013"
},
{
"item": "iPhone",
"serial": "X38320093X032309",
"year": "2015"
}
]
},
{
"name": "fluffikins",
"product": [
{
"item": "iMac",
"serial": "F392D392033X3232",
"year": "2013"
},
{
"item": "iPad",
"serial": "FE322230D3223S21",
"year": "2011"
}
]
}
]
Here is my mock data set that lives in data.txt
Nancy;Macbook Pro;A34D05980FCD4303;2019
Nancy;iPad;O0403X3028423C92;2015
Nancy;iPhone;X3830238S3309230;2017
John;Macbook Pro;X2020J393983H380;2013
John;iPhone;X38320093X032309;2015
fluffikins;iMac;F392D392033X3232;2013
fluffikins;iPad;FE322230D3223S21;2011
Instead of an array you can use Map in reduce as accumulator, use name as key in Map and club value of all keys, finally just get the values Map to get desired output
const data = `Nancy;Macbook Pro;A34D05980FCD4303;2019
Nancy;iPad;O0403X3028423C92;2015
Nancy;iPhone;X3830238S3309230;2017
John;Macbook Pro;X2020J393983H380;2013
John;iPhone;X38320093X032309;2015
fluffikins;iMac;F392D392033X3232;2013
fluffikins;iPad;FE322230D3223S21;2011`
const final = data.split('\n')
.map(v => v.split(';'))
.reduce((op, [name, item, serial, year]) => {
let obj = { item, serial, year }
if (op.has(name)) {
op.get(name).products.push(obj)
} else{
op.set(name,{name, products:[obj]})
}
return op
}, new Map())
console.log([...final.values()])
Here is a "functional version" that utilizes a Map to find duplicates in O(1):
(map => (
fs.readFileSync('./data.txt', 'UTF8')
.trim()
.split('\r\n')
.map((line) => line.split(';'))
.forEach(([name, item, serial, year]) =>
map.has(name)
? map.get(name).product.push({ item, serial, year })
: map.set(name, { name, product: [{ item, serial, year }] })
),
[...map.values()]
)(new Map)
But seriously, whats so bad about imperative style?:
const customers = new Map;
const entries = fs.readFileSync('./data.txt', 'UTF8')
.trim()
.split('\r\n');
for(const entry of entries) {
const [name, item, serial, year] = entry.split(";");
const product = { item, serial, year };
if(customers.has(name)) {
customers.get(name).product.push(product);
} else customers.set(name, { name, product: [product] });
}
const result = [...customers.values()];
You can modify the .reduce function to only add a new item to the array if there isn't one with that name. If there is, just add the product to that item's product array.
const data = `Nancy;Macbook Pro;A34D05980FCD4303;2019
Nancy;iPad;O0403X3028423C92;2015
Nancy;iPhone;X3830238S3309230;2017
John;Macbook Pro;X2020J393983H380;2013
John;iPhone;X38320093X032309;2015
fluffikins;iMac;F392D392033X3232;2013
fluffikins;iPad;FE322230D3223S21;2011`;
const result = data.trim()
.split('\n')
.map((line) => line.split(';'))
.reduce((customers, line) => {
const product = {
item: line[1],
serial: line[2],
year: line[3]
};
const customer = customers.find(({
name
}) => name === line[0]);
if (customer) {
customer.product.push(product);
} else {
customers.push({
name: line[0],
product: [product]
});
}
return customers
}, []);
console.log(result);
I'm facing some issue in for loop while creating an object from array of object.I have an array as this in node js app:
[
{
"Material": "113/133",
"Name": [
{
"name": "WELD1",
"value": 27520
},
{
"name": "WELD2",
"value": 676992
},
{
"name": "WELD3",
"value": 421
}
]
},
{
"Material": "150/300",
"Name": [
{
"name": "WELD1",
"value": 1441
},
{
"name": "WELD2",
"value": 555
},
{
"name": "WELD3",
"value": 100992
}
]
}
]
I want to return object like this which contains all the Material as array, Name and there value in array of object like this:
{
Material: ["113/133", "150/300"],
datasets: [
{
label: "WELD1",
data: [27520,1441]
},
{
label: "WELD2",
data: [676992,555]
},
{
label: "WELD3",
data: [100,20,0]
}
]
}
I want to get result using for loop.
you can use .reduce() and do something like this:
var arr = [
{
"Material": "113/133",
"Name": [
{
"name": "WELD1",
"value": 27520
},
{
"name": "WELD2",
"value": 676992
},
{
"name": "WELD3",
"value": 421
}
]
},
{
"Material": "150/300",
"Name": [
{
"name": "WELD1",
"value": 1441
},
{
"name": "WELD2",
"value": 555
},
{
"name": "WELD3",
"value": 100992
}
]
}
];
var newArr = arr.reduce((acc, ob) => {
for (var key in ob)
if(typeof acc[key] === 'object')
acc[key] = acc[key] ? acc[key].concat(ob[key]) : [ob[key]];
else
acc[key] ? acc[key].push(ob[key]) : acc[key] = [ob[key]];
return acc;
}, {});
console.log(newArr);
let array = [
{
"Material": "113/133",
"Name": [
{
"name": "WELD1",
"value": 27520
},
{
"name": "WELD2",
"value": 676992
},
{
"name": "WELD3",
"value": 421
}
]
},
{
"Material": "150/300",
"Name": [
{
"name": "WELD1",
"value": 1441
},
{
"name": "WELD2",
"value": 555
},
{
"name": "WELD3",
"value": 100992
}
]
}
]
let answer = {Material: [], datasets: []}
array.forEach(x => {
answer.Material.push(x.Material);
x.Name.forEach(na => {
let object = answer.datasets.find(obj => obj.label === na.name) || {label: "", data: []};
if(object.label === ""){
object.label = na.name;
object.data.push(na.value);
answer.datasets.push(object);
}else{
object.data.push(na.value)
}
});
});
console.log(answer);
The above is alternative solution using forEach instead of reduce
Use of Array.reduce to build your new data structure using data you have
const start = [{
"Material": "113/133",
"Name": [{
"name": "WELD1",
"value": 27520
},
{
"name": "WELD2",
"value": 676992
},
{
"name": "WELD3",
"value": 421
}
]
},
{
"Material": "150/300",
"Name": [{
"name": "WELD1",
"value": 1441
},
{
"name": "WELD2",
"value": 555
},
{
"name": "WELD3",
"value": 100992
}
]
}
];
const end = start.reduce((tmp, {
Material,
Name,
}) => {
// Handle the material
// If it do not exist in the array, push it
if (!tmp.Material.includes(Material)) {
tmp.Material.push(Material);
}
// Handle the datasets
// Look at each Name
Name.forEach(({
name,
value,
}) => {
// Can we find the label?
const labelFind = tmp.datasets.find(y => y.label === name);
// If we can't find the label, create a new dataset
if (!labelFind) {
tmp.datasets.push({
label: name,
data: [
value,
],
});
return;
}
// If we has found it push new value in the dataset
labelFind.data.push(value);
});
return tmp;
}, {
Material: [],
datasets: [],
});
console.log(end);
// This is the old fashioned way.
// Iterate over whole array,
// make a map, push value where 'name' is found in map
// later iterate over this map - dataMap - and form required datasets array.
var Material = [];
var dataMap = {};
arr.forEach(obj => {
Material.push(obj.Material);
obj.Name.forEach(item => {
if(dataMap[item.name]){
dataMap[item.name].push(item.value);
}
else {
dataMap[item.name] = [item.value];
}
});
});
var datasets = [];
Object.keys(dataMap).forEach(label => {
datasets.push({
label: label,
data: dataMap[label]
});
});
var result = {
Material: Material,
datasets: datasets
}
console.log(result);