Apply fill to range of cells

we can apply fill to a particular cell. But is there a way to apply fill to a range of cells like below?

    worksheet.getCell('A1:C3').fill = {
                type: 'pattern',
                pattern:'solid',
                fgColor:{argb:'FFFF0000'}
            };

[dnshr]

that 2nd example throws forEach is not a function error.

[chenop]

Confirm that forEach throw exception.

Here is how I’ve implment it:

['A1', 'B1', 'C1', 'D1', 'E1', 'F1', 'G1'].map(key => {
        sheet.getCell(key).fill = {
            type: 'pattern',
            pattern:'solid',
            fgColor:{argb:'cccccc'}
        };
    });