gistfile1.txt

-(NSString *)getConditionStr:(NSInteger)index
{
    static NSDictionary *mapping = nil;
    NSString *(^getTitle)(void);
    
    if (!mapping) {
        mapping = @{
                    @1: ^(void){
                        return [NSString stringWithFormat:@"%@", index % 2 ? @"True1" : @"False1"];
                    },
                    @2: ^(void){
                        return [NSString stringWithFormat:@"%@", index % 2 ? @"True2" : @"False2"];
                    },
                    @3: ^(void){
                        return [NSString stringWithFormat:@"%@", index % 2 ? @"True3" : @"False3"];
                    }
                    };
    }
    getTitle = mapping[@(index)];
    return getTitle();
}