function appendString() {
var range = SpreadsheetApp.getActiveSheet().getActiveRange();
var values = range.getValues();
var modified = values.map(function (row) {
return row.map(function (col) {
return col + " string";
});
})
range.setValues(modified);
}function appendString() {
const range = SpreadsheetApp.getActiveSheet().getActiveRange();
const values = range.getValues();
const modified = values.map(row => row.map(currentValue => currentValue + " string"));
range.setValues(modified);
}function appendString() {
var range = SpreadsheetApp.getActiveSheet().getActiveRange();
var values = range.getValues();
values.forEach(function(row, rowId) {
row.forEach(function(col, colId) {
values[rowId][colId] += " string";
});
});
range.setValues(values);
}