How to convert multiple Objects to an Array [] of key-value pairs in javascript

Question

I'm trying to display a table in react-native but it requires the data to be in arrays,

the API returns an object with all the rows, so far I have managed to convert only if there is a single row and doesn't convert the second row if its available.

Api from the server

0: {title: "Transportation", amount: "100"}
1: {title: "Food", amount: "50"}

what I need is

0:["Transportation", "100"]
1:["Food", "50"]

this is my code

const state = this.state;
let table = this.state.payments;
console.log(table);
const tableD = Object.keys(table[0]).map((key, index) => table[0][key]);
console.log(tableD);
const tableData = [tableD];
console.log(tableData);
return (
    <Table borderStyle={{borderWidth: 2, borderColor: theme.colors.primary}}>
    <Row data={state.tableHead} style={{ height: 40, backgroundColor: theme.colors.gray2}} textStyle={{margin: 6}}/>
    <Rows data={tableData} textStyle={{ margin: 6, }}/>
    </Table>
)

this is the error that I get

Invariant Violation: Objects are not valid as a React child (found: object with keys {title, amount}). If you meant to render a collection of children, use an array instead.

What could I be doing wrong?

Auticcat · Accepted Answer · 2019-08-28 14:01:08Z

1

That's because you are telling it to change just the first (index 0) value in the array.

First of all, you need to use Object.values as said by matevzpoljianc, after that you need to loop trough all your array.

So it would be:

let table = this.state.payments;  
const tableD = this.state.payments.map(item=>Object.values(item))
console.log(tableD);

Now you would've your array of arrays.

EDIT.

If you server is responding with an object that has numbers as keys then what I've wrote won't work, but you can simply hotfix it to:

 let table = this.state.payments;
 const tableD = Object.values(this.state.payments).map(item=>Object.values(item))
 console.log(tableD);

edited Aug 28, 2019 at 14:01

answered Aug 28, 2019 at 12:00

Auticcat

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2 Comments

Modality Maphosa Over a year ago

worked like a charm with a single tweak, thanks final edit let table = this.state.payments; //your array of objects const tableD = Object.values(this.state.payments[0]).map(item=>Object.values(item)) console.log(tableD);

Auticcat Over a year ago

Glad that my answer helped you, and welcome to Stack Overflow. If this answer or any other one solved your issue, please mark it as accepted.

matevzpoljanc · Accepted Answer · 2019-08-28 11:53:05Z

0

Use Object.values(obj) function to get just values.

If you need key, value pairs you can use Object.entries(obj)

answered Aug 28, 2019 at 11:53

matevzpoljanc

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Comments

thecodrr · Accepted Answer · 2019-08-28 12:01:18Z

0

It's quite simple, here's how:

let table = this.state.payments.slice(); //use .slice() to create a copy.
for(row in table){
   table[row] = Object.values(table[row]); //direct transformation
}
console.log(table); //table is your formatted table.

answered Aug 28, 2019 at 12:01

thecodrr

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