React-table add total as first row - reactjs

Question

I'm using react-table 6.9.2. I want to be able to add a row at the top (right under the header) that displays the total of each column.
Here is my function that just outputs a table with static values:
function App() {
const data = [
{
one: 2,
two: 10.4,
three: 10.1,
four: 54,
five: 5,
six: 5,
seven: 10,
eight: 10,
nine: 10
},
{
one: 1,
two: 10.4,
three: 10.1,
four: 54,
five: 5,
six: 5,
seven: 10,
eight: 10,
nine: 10
}
];
return (
<div className="App">
<ReactTable
data={data}
showPagination={false}
columns={[
{
Header: "Sales Overview",
columns: [
{
Header: "one",
id: "one",
accessor: "one",
show: true
},
{
Header: "two",
accessor: "two",
show: true
},
{
Header: "three",
id: "three",
accessor: "three",
show: true
},
{
Header: "four",
id: "four",
accessor: "four",
show: true
},
{
Header: "five",
id: "five",
accessor: "five",
show: true
},
{
Header: "six",
id: "six",
accessor: "six",
show: true
},
{
Header: "seven",
id: "seven",
show: true,
accessor: "seven"
},
{
Header: "eight",
id: "eight",
show: true,
accessor: "eight"
},
{
Header: "nine",
id: "nine",
accessor: "nine",
show: true
}
]
}
]}
loading={false}
minRows={1}
className="-striped -highlight"
/>
</div>
);
}
Is there a way I can add a total row at the top? Even if I get the total value of each column sent within data, can I order it to always display the total row at the top?
In case it's any help, I have also created a sandbox to show the table: https://codesandbox.io/s/2vz3z741op
Thanks in advance!

Answer 1

You can just add a totals entry to the data array:
https://codesandbox.io/s/qv7vjpr69
const getTotals = (data, key) => {
let total = 0;
data.forEach(item => {
total += item[key];
});
return total;
};
function App() {
const data = [
{
one: "first row",
two: 10.4,
...
},
{
one: "second row",
two: 10.4,
...
}
];
data.unshift({
one: "totals",
two: getTotals(data, "two"),
three: getTotals(data, "three"),
four: getTotals(data, "four"),
five: getTotals(data, "five"),
six: getTotals(data, "six"),
seven: getTotals(data, "seven"),
eight: getTotals(data, "eight"),
nine: getTotals(data, "nine")
});