You can get the number of rows using the DataTable#getNumberOfRows() method.
Use it like this:
for (i = 0; i < data.getNumberOfRows; i++) {
for (j = 0; j < data.getNumberOfColumns(); j++) {
var val = data.getValue(i, j);
// do something with the value
data.setValue(i, j, newVal);
}
}
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