[Bug]: Object array data source causes spliceRow call error: rowData.slice is not a function about handsontable HOT 2 CLOSED

Thank you for your answer. The problem was caused by my misunderstanding of the documentation, so I could add new rows via hot.alter('insert_row', hot.countRows()); and then set the row data via setDataAtRowProp

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Hi @watchingfun

The spliceRow(), as mentioned in the documentation at https://handsontable.com/docs/react-data-grid/api/core/#splicerow, is made for arrays (not objects).

Underneath it calls thepopulateFromArray method https://github.com/handsontable/handsontable/blob/56d54d6e98da2b4d376829cb4077f4dea7b4a131/handsontable/src/dataMap/dataMap.js#L690C14-L690C31

so to add columns with data you'd need to alter the data object or change the columns settings and then add data, for example with the setDataAtCell() or setDataAtRowProp.

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