Adding new columns dynamically with mui-datatable - reactjs

Question

I want to add a new column in mui-datatable every time a button is pressed. However datatables doesn't seem to be rendering it. However, if I clicked on the add column button, and then select the dropdown, the new columns appear. Furthermore the selected dropdown value does not seem to be reflected as well . I've narrowed the issue down to using const [columns,setColumns] = useState(...) for the column, but without that, I can't add any new columns dynamically at all. Appreciate any help to get me out of this pickle, thank you.
https://codesandbox.io/s/unruffled-sun-g77xc
const App = () => {
function handleChange(event) {
setState({ value: event.target.value });
}
const [state, setState] = useState({ value: "coconut" });
const [columns, setColumns] = useState([
{
name: "Column 1",
options: {}
},
{
name: "Column with Input",
options: {
customBodyRender: (value, tableMeta, updateValue) => {
return (
<div>
<select value={state.value} onChange={handleChange}>
<option value="grapefruit">Grapefruit</option>
<option value="lime">Lime</option>
<option value="coconut">Coconut</option>
<option value="mango">Mango</option>
</select>
</div>
);
}
}
}
]);
const options = {
responsive: "scroll"
};
const addColumn = () => {
columns.push({
name: "NewColumn",
label: "NewColumn"
});
setColumns(columns);
};
const data = [["value", "value for input"], ["value", "value for input"]];
return (
<React.Fragment>
<MUIDataTable columns={columns} options={options} data={data} />
//add a new column if this button is clicked
<button onClick={addColumn}>Add Column</button>
</React.Fragment>
);
};

Answer 1

Your new column wasn't actually getting pushed to the columns variable. When you're using useState, you can't make changes to the variable unless you use setColumns, otherwise it won't trigger a rerender. Try this:
const addColumn = () => {
setColumns([ ...columns, {
name: "NewColumn"
}]);
};
Or this:
const addColumn = () => {
const editableColumns = [...columns];
editableColumns.push({
name: "NewColumn"
});
setColumns(editableColumns);
};
Both will work, it's just your preference.
You can test if it's editing the columns with this:
useEffect(() => console.log(columns), [columns]);