React Native slice() function undefined error

I want to update my listview row for that I am trying to slice listview datasource but its raising below error:

this.state.dataSource.slice is not a function. (In 'this.state.dataSource.slice()', 'this.state.dataSource.slice' is undefined)

And here is my code:

let newArray = this.state.dataSource.slice();
newArray[indexToUpdate] = {
  //Here I am updating my values.
};
this.setState({
  dataSource: this.state.dataSource.cloneWithRows(newArray),
});

Let me know if there is any error in my code or something wrong I have done.

this.state.dataSource is not an Array, that's why you cant do slice() on dataSource. It looks like this

{ _rowHasChanged: [Function: rowHasChanged],
  _getRowData: [Function: defaultGetRowData],
  _sectionHeaderHasChanged: [Function],
  _getSectionHeaderData: [Function: defaultGetSectionHeaderData],
  _dataBlob: { s1: [ 'row 1', 'row 2' ] },
  _dirtyRows: [ [ true, true ] ],
  _dirtySections: [ true ],
  _cachedRowCount: 2,
  rowIdentities: [ [ '0', '1' ] ],
  sectionIdentities: [ 's1' ] 
}

Your required array is in _dataBlob key of that object.

Note: it's working fine and updates listview dataSource using below line

this.state.dataSource._dataBlob.s1.slice()