If statement in for loop referencing incremented variable - google-apps-script

Question

as quite an novice when it comes to coding, I ran into this problem with my code:
I use Google App Script [Edit: Corrected Google App Engine to Google App Script] to go through a list of timestamps and filter for stamps that equal the current month. Therefor I load the spreadsheet, the according sheet and get the data from all the rows as an object.
In the next step I go though all the elements of the object and check whether they contain the current date.
/* Initial data */
var email = "name#domain.com";
var spreadsheet = SpreadsheetApp.openById("1bN7PTOa6PwryVvcGxzDxuNVkeZMRwYKAGFnQvxJ_0nU");
var tasklist = spreadsheet.getSheets()[0].getDataRange();
var tasks = tasklist.getValues();
var tasksnum = tasklist.getNumRows();
Logger.log(tasks[7][2]); //Console returns "01.12.2014"
Logger.log(tasks[7][2].indexOf(month)); //Console returns "12.2014"
/* Filter tasks by month */
for (var i = 1; i < 9; i++) {
if (tasks[i][2].indexOf(month) >= 0) {
Logger.log(tasks[i]);
}
else {
return;
}
}
What drives me crazy is the following: As stated above, the for loop doesn't work. But if I alter it like this
if (tasks[7][2].indexOf(month) >= o) {
it works like a charm. And that's what I don't get. i should be incremented til 9 so should be seven at some point. At least then, the condition should be true and the loop should return a log.
What am I missing?
Thank you all in advance.
ps: If I am just following the wrong path of how to implement the function, please let me know.
ps2: I think my question's title is a bit cryptic. If you have a better one in mind, I'd love to change it.

Answer 1

The reason your original code doesn't work is due to the return statement in your else block. Return exits the function immediately, so your loop never gets past the first "false" of your IF.
remove the "return" (or the else block entirely) and your code should work.

Answer 2

I'm not sure what's supposed to be in the month variable but I suggested building a string to match your date format and doing string comparisons instead of the indexOf() strategy you're trying. This code is tested and does just that:
function test() {
/* Initial data */
var spreadsheet = SpreadsheetApp.openById("");
var tasklist = spreadsheet.getSheets()[0].getDataRange();
var tasks = tasklist.getValues();
var tasksnum = tasklist.getNumRows();
/* Filter tasks by month */
var today = Utilities.formatDate(
new Date(),
spreadsheet.getSpreadsheetTimeZone(),
"dd.MM.yyyy"
);
for(var i=1; i<9; i++){
if (tasks[i][2] == today){
Logger.log(tasks[i]);
}
}
}