Objective C: Sort Two Dimensional Array

Question

I have an array of arrays. The contained array\'s first elements are all NSDate objects. I would like to sort the array containing the arrays in order from most recent to le

Answer 1

If array is mutable and you want to sort it in place:

[array sortUsingComparator:^(id a, id b) {
    return [b[0] compare:a[0]];
}];

If array is immutable or you want to leave it alone and make a sorted copy:

NSArray *sortedArray = [array sortedArrayUsingComparator:^(id a, id b) {
    return [b[0] compare:a[0]];
}];