How to get number of sheet from list - google-apps-script

Question

What script should do. First, get sheet names from range on sheet List_1. Then, using this array of names, put some data only on these sheets.
https://docs.google.com/spreadsheets/d/1Xdws6Vr6YVXuj19mvpOvkpJokOfY2T7Sh1aMpous_Xw/edit#gid=0
function VList() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheets = ss.getSheets();
var sheetNames = ss.getSheetByName("List_1");
var rangeNames = sheetNames.getRange("B3:B5").getValues();
for (var sheetId = 0; sheetId<sheets.length; sheetId++){
if(sheets[sheetId].getSheetName() == rangeNames) {
ss.getRange("C1").setValue("done");
}
}
}
Problem. When script starts - nothing happens. How to get number of sheet and vlookup only on them? Maybe, exist some function like "getSheetId" which can get number of sheet.
Solved, thanks to bruce.
function VList() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheets = ss.getSheets();
var sheetNames = ss.getSheetByName("List_1").getRange("B3:B5").getValues();
sheetNames.forEach(function(row) {
var sheet = ss.getSheetByName (row[0]);
if (!sheet) throw 'missing sheet ' + row[0];
sheet.getRange("c1").setValue ("done");
});
}

Answer 1

getValues() returns a two dimensional array, which you then compare with a string value - so that will never be true.
Once you fix that, you will still be updating the same cell, C1 with 'done' multiple times - ss points to the List_1 sheet - I assume you mean to update the sheet whose name is in the list.
Why not just use the list in b3:b5 to simply get each sheet by name and update it? There's no need to go through the sheets list since you already know their names.
something like
ss.getSheetByName("List_1").getRange("b3:b5").getValues()
.forEach(function(row) {
var sheet = ss.getSheetByName (row[0]);
if (!sheet) throw 'missing sheet ' + row[0];
sheet.getRange("c1").setValue ("done");
});