How should i use Array.slice in a variable?

Question

I'm trying to upload csv file and display it on Table.

So I'm trying to display info data on DataTable and I got an error info[0].slice is not a function.

So I tried to comment info[0].slice this out . then it works but I can't get the column.label when i uncomment info[0].slice after i upload a file.

I don't know what happens behind it so i can't figure out .

So How can i make columns work ??

my code is like this :

  const [info, setInfo] = useState([{}]);
  const handleOnDrop = droppedItems => {
    const infos = droppedItems.map(item => item.data);

    setInfo([...infos]);
  };

const DataTable = ({ info }) => {
  // const columns = []; //this is what i was trying to do to make columns work afterwards.

  const columns = info[0]
    .slice(undefined)
    .map(inf => [{ id: inf, label: inf, minWidth: 170, align: "left" }]);

<TableRow>
              {columns.map(column => (
                <TableCell
                  key={column.id}
                  align={column.align}
                  style={{ minWidth: column.minWidth }}
                >
                  <select name="" id="">
                    <option value="3" selected>
              
                    </option>
                    <option value="0">x</option>
                    <option value="1">y</option>
                    <option value="2">label</option>
                    
                  </select>{" "}
                  <p>{column.label}</p>
                </TableCell>

this should be the results when it works !

I'm trying to get all Array from info[0] with slice(undefined) — KYUN
– KYUN, Commented Jun 17, 2021 at 3:17
it is (4) ["age ", "name", "phone", "city"] that is from a csv file (it's console results) — KYUN
– KYUN, Commented Jun 17, 2021 at 3:20
I should get the array from random data so i tried to do it like that — KYUN
– KYUN, Commented Jun 17, 2021 at 3:20

N G · Accepted Answer · 2021-06-17 03:22:19Z

1

From what I can see in your code - info is an array of objects.

Therefore info[0] is an object (not an array) and it doesn't have a splice method.

I'm not sure what's the purpose of slice(undefined) in your code. Could you please explain?

I would suggest you create a Minimal Working Sample, which reproduces your issue in JSFiddle. This will make it easier for us to help you out.

answered Jun 17, 2021 at 3:22

N G

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1 Comment

KYUN Over a year ago

I'm trying to get all Array from info[0] with slice(undefined) to get all the Array from uploaded csv file .

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