One function for multiple sheets in Google Sheets - google-apps-script

Question

in Google Sheets I have to repeat a function because getSheetByName() does not accept an array of sheets, it only accepts one sheet.
Is there a way to have one function that loops through specified sheets (not all sheets)?
i.e.
("Sheet1", "Sheet2" ) etc.
function recordHistory_1() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName("Sheet1");
var source = sheet.getRange("A2:B2");
var values = source.getValues();
values[0][0] = new Date();
sheet.appendRow(values[0]);
};
function recordHistory_2() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName("Sheet2");
var source = sheet.getRange("A2:B2");
var values = source.getValues();
values[0][0] = new Date();
sheet.appendRow(values[0]);
};
Reason I'm asking is because I have over 20 sheets, and so I have to write this function 20 times...

Answer 1

You can generalize / reuse the same function for 20 different calls as follows.
var sheetListArray = ["Sheet1", "Sheet2", "Sheet3"......"Sheet20"]
var ss = SpreadsheetApp.getActiveSpreadsheet();
for( var i = 1 ; i <= sheetListArray.length ; i++)
// You can call the below function 20 time with different Sheet name each time.
recordHistory(sheetListArray[i]);
}
function recordHistory(sheetName) {
var sheet = ss.getSheetByName(sheetName);
var source = sheet.getRange("A2:B2");
var values = source.getValues();
values[0][0] = new Date();
sheet.appendRow(values[0]);
}

Answer 2

You can also call the function once and loop through an array of sheetnames inside the function.
function recordHistory() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
["Sheet1", "Sheet2", "Sheet3"].forEach(function (s) {
var sheet = ss.getSheetByName(s);
var values = sheet.getRange('A2:B2').getValues()
values[0][0] = new Date();
sheet.appendRow(values[0]);
})
}