I'm using got for requests.
Code:
const response = await got(`https://airapi.airly.eu/v2/measurements/installation?installationId=204`, {
headers: {
apikey: `API_KEY`
},
json: true
});
console.log(response.body.current.values);
Output:
[ { name: 'PM1', value: 20.72 },
{ name: 'PM25', value: 32.43 },
{ name: 'PM10', value: 61.22 },
{ name: 'PRESSURE', value: 1028.46 },
{ name: 'HUMIDITY', value: 91.59 },
{ name: 'TEMPERATURE', value: 10.87 } ]
Now, I want to display it to the user in this format:
PM1: 20.72 µg/m3
PM25: 32.43 µg/m3
PM10: 61.22 µg/m3
My question is: What's the best way to do that? In the future, I also want to use a library like https://www.chunqiuyiyu.com/ervy/, so it would be nice to have this data somehow separated. I hope that I've made myself clear :)
It looks like Envy uses a specific structure for its data, so you first need to convert your existing data:
const data = arr.map(el => ({ ...el, key: el.name }));
Then you can map over the elements and join them with line breaks afterwards, printing them to the console.
Demo:
const arr = [{"name":"PM1","value":20.72},{"name":"PM25","value":32.43},{"name":"PM10","value":61.22},{"name":"PRESSURE","value":1028.46},{"name":"HUMIDITY","value":91.59},{"name":"TEMPERATURE","value":10.87}];
// create an envy structure from the original data using `map`
const data = arr.map(el => ({ ...el, key: el.name }));
// `map` over that data and return an array of strings
// separated by line breaks
const str = data.map(el => `${el.key}: ${el.value} µg/m3`).join('\n');
console.log(str);
simply you can do like
var data = [ { name: 'PM1', value: 20.72 },
{ name: 'PM25', value: 32.43 },
{ name: 'PM10', value: 61.22 },
{ name: 'PRESSURE', value: 1028.46 },
{ name: 'HUMIDITY', value: 91.59 },
{ name: 'TEMPERATURE', value: 10.87 } ];
$.each(data, function (i) {
console.log(data[i].name+':'+data[i].value);
});
Lots of ways to do this (without resorting to a library). One way:
let data = [
{ name: 'PM1', value: 20.72 },
{ name: 'PM25', value: 32.43 },
{ name: 'PM10', value: 61.22 },
{ name: 'PRESSURE', value: 1028.46 },
{ name: 'HUMIDITY', value: 91.59 },
{ name: 'TEMPERATURE', value: 10.87 }
];
data.forEach(v => console.log(`${v.name}: ${v.value} µg/m3`));
Related
I have below javascript object - (named Division)
I want to extract only SubDivs from the array
I tried : -
const division = [{
Name: "DivName1",
Value: "DivValue1",
SubDivision: {
Name: "SubDiv1",
Value: "SubDiv1"
}
},
{
Name: "DivName2",
Value: "DivValue2",
SubDivision: [{
Name: "SubDiv2",
Value: "SubDiv2"
},
{
Name: "SubDiv3",
Value: "SubDiv3"
}
]
}
]
var subDivs = division.map(x => x.SubDivision);
console.log(subDivs)
But this is not giving me array in format -
[{
Name:"SubDiv1",
Value:"SubDiv1"
},
{
Name:"SubDiv2",
Value:"SubDiv2"
},
{
Name:"SubDiv3",
Value:"SubDiv3"
}]
You can use flatMap for that
const division = [{
Name: "DivName1",
Value: "DivValue1",
SubDivision: [{
Name: "SubDiv1",
Value: "SubDiv1"
}]
},
{
Name: "DivName2",
Value: "DivValue2",
SubDivision: [{
Name: "SubDiv2",
Value: "SubDiv2"
},
{
Name: "SubDiv3",
Value: "SubDiv3"
}
]
}
]
const subdivision = division.flatMap(d => d.SubDivision)
console.log(subdivision)
Given your example, all you need to do is call flat on the mapped array:
var subDivs= division.map(x=>x.SubDivision).flat();
Working example:
const division = [{
Name: "DivName1",
Value: "DivValue1",
SubDivision: [{
Name: "SubDiv1",
Value: "SubDiv1"
}
]},
{
Name: "DivName2",
Value: "DivValue2",
SubDivision: [{
Name: "SubDiv2",
Value: "SubDiv2"
},
{
Name: "SubDiv3",
Value: "SubDiv3"
}
]
}
]
var subDivs= division.map(x=>x.SubDivision).flat();
console.log(subDivs)
I have a array of object which has a inside array which need to be filtered and return array based on matches from both. search is (input) event, which executes on every key press.
stackblitz link stackblitz
list = [
{
id: 'abc',
data: [
{ key: '1', value: 'car' },
{ key: '2', value: 'bus' },
{ key: '3', value: 'bike' },
{ key: '4', value: 'truck' },
{ key: '5', value: 'jeep' },
],
},
{
id: 'def',
data: [
{ key: '1', value: 'car' },
{ key: '2', value: 'bicycle' },
{ key: '3', value: 'train' },
{ key: '4', value: 'aeroplane' },
{ key: '5', value: 'jeep' },
],
},
];
handleSearch = (event) => {
if (event.target.value.length > 0) {
const item = this.list[0].data.filter((items) =>
items.value.toLowerCase().includes(event.target.value.toLowerCase())
);
this.list[0].data = item;
} else {
this.list[0].data = this.orgList;
}
};
expect output
input = car
output = [
{
id: 'abc',
data: [
{ key: '1', value: 'car' },
],
},
{
id: 'def',
data: [
{ key: '1', value: 'car' },
],
},
];
input = truck
output =
[
{
id: 'abc',
data: [
{ key: '4', value: 'truck' },
],
},
];
const list = [{id: 'abc',data: [{ key: '1', value: 'car' },{ key: '2', value: 'bus' },{ key: '3', value: 'bike' },{ key: '4', value: 'truck' },{ key: '5', value: 'jeep' },],},{id: 'def',data: [{ key: '1', value: 'car' },{ key: '2', value: 'bicycle' },{ key: '3', value: 'train' },{ key: '4', value: 'aeroplane' },{ key: '5', value: 'jeep' },],},];
function search(arr, searchVal) {
return arr.map((item) => {
const data = item.data.filter(({ value }) => value === searchVal);
return { ...item, data };
})
.filter(({ data }) => data.length);
}
console.log(search(list, 'car'));
console.log(search(list, 'truck'));
.as-console-wrapper { max-height: 100% !important; top: 0 }
Angular demo
I know that I might be going a bit outside of the scope of your requirements here, but I just simply thought that it might be easier to do it like this.
I just thought that it might be somewhat more scalable this way, if you first flatten the structure, because for arguments sake, let's say that you're data structure needs to become more & more complex overtime, IDK, business requirements change. At least if you have some layer of abstraction to manage that, you can then filter on an array of objects quite simply, like I've done below.
Depending on your needs you may not even need to flatten the structure, it's just my opinion & experience states this to be an easier & more maintainable kinda solution to scale. If you're data structure dose evolve with complexity, where there may be nested structures, you could always look at using some clever little recursive function to flatten your structure.
It's worth also noting that I've added some validation to the search function, while it's probably not a requirement, it's not a bad idea to include such logic, where you could update state on your view model. You could include something like a toast notification, stating that the user has provided an invalid search term, you could be making a request to a server to get this data & you could say that there were no results, etc, I think you get the idea?
I hope that's helped & I'm sorry if I've gone a little OTT. 😅
const list = [
{
id: 'abc',
data: [
{ key: '1', value: 'car' },
{ key: '2', value: 'bus' },
{ key: '3', value: 'bike' },
{ key: '4', value: 'truck' },
{ key: '5', value: 'jeep' },
],
},
{
id: 'def',
data: [
{ key: '1', value: 'car' },
{ key: '2', value: 'bicycle' },
{ key: '3', value: 'train' },
{ key: '4', value: 'aeroplane' },
{ key: '5', value: 'jeep' },
],
},
];
const flattenStructure = data => {
return data.reduce((accumulator, item) => {
const items = item.data.reduce((vehicles, vehicle) => {
const modified = { ...vehicle, id: item.id };
return vehicles.concat(modified);
}, []);
return accumulator.concat(items);
}, []);
};
const search = (array, term) => {
const invalidTerm = term == null || typeof term != 'string' || term.replace(/ /g, '') == '';
const invalidArray = array == null || !Array.isArray(array);
if (invalidTerm || invalidArray) {
console.log("Invalid arguments provided.");
return array;
}
return flattenStructure(array).filter(vehicle => {
const match = vehicle.value.toLowerCase() == term.toLowerCase();
const contains = vehicle.value.toLowerCase().indexOf(term.toLowerCase()) > -1;
return match || contains;
});
};
console.log(search(list, 'car'));
console.log(search(list, 'truck'));
Generaly speaking, when dealing with filtering, avoid using same original array to display filtered results in template.
Concerning filtering function, this should do the trick:
import { Component, OnInit } from '#angular/core';
#Component({
selector: 'my-app',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css'],
})
export class AppComponent implements OnInit {
public list: any;
public orgList: any;
public filteredList: any;
ngOnInit() {
this.list = this.orgList = [
{
id: 'abc',
data: [
{ key: '1', value: 'car' },
{ key: '2', value: 'bus' },
{ key: '3', value: 'bike' },
{ key: '4', value: 'truck' },
{ key: '5', value: 'jeep' },
],
},
{
id: 'def',
data: [
{ key: '1', value: 'car' },
{ key: '2', value: 'bicycle' },
{ key: '3', value: 'train' },
{ key: '4', value: 'aeroplane' },
{ key: '5', value: 'jeep' },
],
},
];
}
filterData = (dataItem, term: string) => {
return dataItem.value.toLowerCase().indexOf(term.toLowerCase()) !== -1;
};
handleSearch = (event) => {
if (event.target.value.length === 0) {
this.filteredList = [];
return;
}
const term = event.target.value;
const temp = this.list.filter((fullItem) =>
fullItem.data.filter((dataItem) => this.filterData(dataItem, term))
);
this.filteredList = temp
.map((fullItem) => ({
...fullItem,
data: fullItem.data.filter((dataItem) =>
this.filterData(dataItem, term)
),
}))
.filter((fullItem) => fullItem.data.length > 0);
};
}
I want to merge Array of ObjectA containing ObjectB attribute by ObjectA attribute.
For example :
let myArray = [
{ name: 'Jeu', series: { name: 'testA', value: '89' } },
{ name: 'Dim', series: { name: 'testB', value: '490' } },
{ name: 'Dim', series: { name: 'testC', value: '978' } }
]
And I would like to transform it to
[
{ name: 'Jeu', series: { name: 'testA', value: '89' } },
{ name: 'Dim', series: [{ name: 'testB', value: '490' },{ name: 'testC', value: '978' } ] }
]
Am I able to do that with a simple reduce/map loop ?
You can first use reduce (with some spread syntax) to build an object that maps unique names and objects in the format you want to have, grouping series by name. Then, you can simply get the values from this object.
const myArray = [
{ name: 'Jeu', series: { name: 'testA', value: '89' } },
{ name: 'Dim', series: { name: 'testB', value: '490' } },
{ name: 'Dim', series: { name: 'testC', value: '978' } }
];
const map = myArray.reduce(
(acc, curr) => ({
...acc,
[curr.name]: {
name: curr.name,
series: acc[curr.name]
? [...acc[curr.name].series, curr.series]
: [curr.series]
}
}),
{}
);
const output = Object.values(map);
console.log(output);
I have the following data structure:
const data = [
{
name: 'ABC',
salesData: [
{
timestamp: '2017-09-01',
value: 10
},
{
timestamp: '2017-09-02',
value: 2
}
]
},
{
name: 'DEF',
salesData: [
{
timestamp: '2017-09-01',
value: 8
},
{
timestamp: '2017-09-02',
value: 3
}
]
}
];
I would like to transform this to:
[
{
name: 'ABC',
'2017-09-01': 10,
'2017-09-02': 2
},
{
name: 'CDE',
'2017-09-01': 8,
'2017-09-02': 3
}
]
I'm trying to use Underscore's Chain and Map which I'm getting confused. So far I have the following, not sure how do I write the convertedSalesData to transform as per the need:
_.map(data, function(item) {
let name = item.name;
let salesData = item.salesData;
let convertedSalesData = ?
})
With ES6 you can use spread syntax ... to get this result.
const data = [{"name":"ABC","salesData":[{"timestamp":"2017-09-01","value":10},{"timestamp":"2017-09-02","value":2}]},{"name":"DEF","salesData":[{"timestamp":"2017-09-01","value":8},{"timestamp":"2017-09-02","value":3}]}]
var result = data.map(function({name, salesData}) {
return {name, ...Object.assign({}, ...salesData.map(({timestamp, value}) => ({[timestamp]: value})))}
})
console.log(result)
const data = [{
name: 'ABC',
salesData: [{
timestamp: '2017-09-01',
value: 10
},
{
timestamp: '2017-09-02',
value: 2
}
]
},
{
name: 'DEF',
salesData: [{
timestamp: '2017-09-01',
value: 8
},
{
timestamp: '2017-09-02',
value: 3
}
]
}
];
var res = data.map(function(a) {
var obj = {
name: a.name
};
a.salesData.forEach(function(x) {
obj[x.timestamp] = x.value;
})
return obj;
})
console.log(res);
Similar to #Nenad Vracar. I perfer to use 'reduce':
data.map(({ name, salesData }) => ({
name,
...salesData.reduce(
(record, { timestamp, value }) => {
record[timestamp] = value
return record
},
Object.create(null)
)
}))
I'm currently trying to retrieve a list of metadata stored as an array, inside an object, inside an array. Here's a better explanatory example:
[
{
name: 'test',
metadata: [
{
name: 'Author',
value: 'foo'
},
{
name: 'Creator',
value: 'foo'
}
]
},
{
name: 'otherTest',
metadata: [
{
name: 'Created',
value: 'foo'
},
{
name: 'Date',
value: 'foo'
}
]
},
{
name: 'finalTest'
}
]
Now, my objective is to retrieve a list of metadata (by their name) without redundancy. I think that .map() is the key to success but I can't find how to do it in a short way, actually my code is composed 2 for and 3 if, and I feel dirty to do that.
The expected input is: ['Author', 'Creator', 'Created', 'Date']
I'm developping in Typescript, if that can help for some function.
You can use reduce() and then map() to return array of names.
var data = [{"name":"test","metadata":[{"name":"Author","value":"foo"},{"name":"Creator","value":"foo"}]},{"name":"otherTest","metadata":[{"name":"Created","value":"foo"},{"name":"Date","value":"foo"}]},{"name":"finalTest"}]
var result = [...new Set(data.reduce(function(r, o) {
if (o.metadata) r = r.concat(o.metadata.map(e => e.name))
return r
}, []))];
console.log(result)
You could use Set for unique names.
var data = [{ name: 'test', metadata: [{ name: 'Author', value: 'foo' }, { name: 'Creator', value: 'foo' }] }, { name: 'otherTest', metadata: [{ name: 'Created', value: 'foo' }, { name: 'Date', value: 'foo' }] }, { name: 'finalTest' }],
names = new Set;
data.forEach(a => (a.metadata || []).forEach(m => names.add(m.name)));
console.log([...names]);
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var data = [{"name":"test","metadata":[{"name":"Author","value":"foo"},{"name":"Creator","value":"foo"}]},{"name":"otherTest","metadata":[{"name":"Created","value":"foo"},{"name":"Date","value":"foo"}]},{"name":"finalTest"}]
data
.filter(function(obj){return obj.metadata != undefined})
.map(function(obj){return obj.metadata})
.reduce(function(a,b){return a.concat(b)},[])
.map(function(obj){return obj.name})
A hand to hand Array.prototype.reduce() and Array.prototype.map() should do it as follows;
var arr = [
{
name: 'test',
metadata: [
{
name: 'Author',
value: 'foo'
},
{
name: 'Creator',
value: 'foo'
}
]
},
{
name: 'otherTest',
metadata: [
{
name: 'Created',
value: 'foo'
},
{
name: 'Date',
value: 'foo'
}
]
},
{
name: 'finalTest'
}
];
result = arr.reduce((p,c) => c.metadata ? p.concat(c.metadata.map(e => e.name))
: p, []);
console.log(result);