"for" loop for Google Spreadsheet values not looping - for-loop

Question

I'm currently writing a statistic spreadsheet script for my guild, which reads out the class of one person and counts it on the statistic sheet.
For some reason the for loops aren't working. When I execute the script, it does nothing. Everything before the for loop seems to work. I have used the debugger, and set a debug point from the point of the for loop and the window is opening and closing after like 1 second.
This is my code as of now:
function addToStatistik() {
var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
var source_sheet = spreadsheet.getSheetByName("Raid Montag");
var source_range_names = source_sheet.getRange("C4:C13");
var source_range_setup_boss1 = source_sheet.getRange("M4:M13");
var target_sheet = spreadsheet.getSheetByName("Statistik");
var target_range_names = target_sheet.getRange("A4:A31");
var target_range_boss1 = target_sheet.getRange("K4:S31");
target_sheet.getRange(2,1).setValue("Debug1"); //testing stuff
for (var i=0; i < source_range_names.length; i++) {
for (var j=0; j < target_range_names.length; j++) {
if (source_range_names[i][0] == target_range_names[j][0]) {
if (source_range_setup_boss1[i][0].indexOf("War") > -1) {
target_sheet.getRange(9,5).setValue("TEST");
}
}
}
}
}
Someone can find any errors in there? I can't find anything and google also isnt helping me.

Answer 1

You are getting the range, but not the values. This line:
var source_range_names = source_sheet.getRange("C4:C13");
gets a range, but not any values.
Should be:
var source_range_names = source_sheet.getRange("C4:C13").getValues();
The outer loop never loops. There is no length of a range.
for (var i=0; i < source_range_names.length; i++) {
You don't need to change the above line, but currently the variable source_range_names is a range, and not a 2D array of values.

Answer 2

Before you iterate you need to get the values of the range, to achieve this you need to use the method getValues() or getDisplayValues():
function leFunction() {
var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
var source_sheet = spreadsheet.getSheetByName("Raid Montag");
var source_range_names = source_sheet.getRange("A1:C13");
var values_range_names = source_range_names.getDisplayValues();
Logger.log(values_range_names);
for (var i=0; i < values_range_names.length; i++) {
// Do Something
}
}