Reset checkboxes to false

Question

I have a Google spreadsheet where column A has checkboxes in each row. I have written a script to perform a function on all rows where the checkboxes are checked, but I want

Answer 1

Alternatively, Since you want to uncheck everything in the range (and all of the range have checkboxes in them), just do:

sheet.getRange('A3:A').setValue(false);

without checking/looping.