simple block-based task queue with cascade

gistfile1.txt

NSMutableArray *tasks = [[NSMutableArray alloc] init];
void (^nextTask)() = ^() {
    [tasks removeObjectAtIndex: 0];
    if ([tasks count] > 0) {
        void (^task)() = [tasks objectAtIndex: 0];
        task();
    }
};
[tasks addObject: ^() {
    NSLog(@"task1");
    nextTask();
}];
[tasks addObject: ^() {
    NSLog(@"task2");
    nextTask();
}];
void (^task)() = [tasks objectAtIndex: 0];
task();