Class PageProtection

// Add the "user@example.com" user to the list of users who can edit this sheet
const sheet = SpreadsheetApp.getActiveSheet();
const permissions = sheet.getSheetProtection();
permissions.addUser('user@example.com');
permissions.setProtected(true);
sheet.setSheetProtection(permissions);

// Determine whether or not sheet protection is enabled
const sheet = SpreadsheetApp.getActiveSheet();
const permissions = sheet.getSheetProtection();
const isProtected = permissions.isProtected();

// Remove the "user@example.com" user to the list of users who can edit this
// sheet
const sheet = SpreadsheetApp.getActiveSheet();
const permissions = sheet.getSheetProtection();
permissions.removeUser('user@example.com');
permissions.setProtected(true);
sheet.setSheetProtection(permissions);

// Enables sheet protection for  this sheet
const sheet = SpreadsheetApp.getActiveSheet();
const permissions = sheet.getSheetProtection();
permissions.setProtected(true);
sheet.setSheetProtection(permissions);