Madanswer Technologies Interview Questions Data|Agile|DevOPs|Python - Recent questions and answers in FuelPHP

Answered: How can I reverse a NSArray in Objective-C?

Mon, 17 Jan 2022 16:18:41 +0000

For reversing a mutable array, you can add the following category to your code:

@implementation NSMutableArray (Reverse)

- (void)reverse {
    if ([self count] <= 1)
        return;
    NSUInteger i = 0;
    NSUInteger j = [self count] - 1;
    while (i < j) {
        [self exchangeObjectAtIndex:i
                  withObjectAtIndex:j];

        i++;
        j--;
    }
}

@end

You can also take advantage of the built-in reverseObjectEnumerator method on NSArray, and the allObjects method of NSEnumerator:

NSArray* reversedArray = [[startArray reverseObjectEnumerator] allObjects];

Answered: Find the bug in the Objective-C code below. Explain your answer?

Mon, 17 Jan 2022 16:17:44 +0000

@interface HelloWorldController : UIViewController  

@property (strong, nonatomic) UILabel *alert;  

@end  

@implementation HelloWorldController  

- (void)viewDidLoad {
     CGRect frame = CGRectMake(150, 150, 150, 50);
     self.alert = [[UILabel alloc] initWithFrame:frame];
     self.alert.text = @"Hello...";
     [self.view addSubview:self.alert];
      dispatch_async(
        dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
        ^{
           sleep(10);
           self.alert.text = @"World";
        }
    ); 
}  

@end

Answer

All UI updates must be performed in the main thread. The global dispatch queue does not guarantee that the alert text will be displayed on the UI. As a best practice, it is necessary to specify any updates to the UI occur on the main thread, as in the fixed code below:

dispatch_async(        
    dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
    ^{
      sleep(10);
      dispatch_async(dispatch_get_main_queue(), ^{
         self.alert.text = @"World";
      });
});

Answered: What is the difference between copy and retain?

Mon, 17 Jan 2022 16:16:38 +0000

n a general setting, retaining an object will increase its retain count by one. This will help keep the object in memory and prevent it from being blown away. What this means is that if you only hold a retained version of it, you share that copy with whomever passed it to you.

Copying an object, however you do it, should create another object with duplicate values. Think of this as a clone. You do NOT share the clone with whomever passed it to you

Answered: What is a protocol, and how do you define your own and when is it used?

Mon, 17 Jan 2022 16:15:23 +0000

A protocol is similar to an interface from Java. It defines a list of required and optional methods that a class must/can implement if it adopts the protocol. Any class can implement a protocol and other classes can then send messages to that class based on the protocol methods without it knowing the type of the class.

@protocol MyCustomDataSource
- (NSUInteger)numberOfRecords;
- (NSDictionary *)recordAtIndex:(NSUInteger)index;
@optional
- (NSString *)titleForRecordAtIndex:(NSUInteger)index;
@end

A common use case is providing a DataSource for UITableView or UICollectionView.

Answered: What is the Session methods in FuelPHP?

Sun, 16 Jan 2022 19:08:43 +0000

Create ()- Used for creating a new session.
Set ()- Used for assigning a session variable.
Destroy ()- Destroying the existing session is the main task of this method.
Get ()- it gets the sessions variable.
Delete ()- It deletes the stored variable which has been retrieved from the sessions

Answered: What are different types of controllers in FuelPHP?

Sun, 16 Jan 2022 19:07:16 +0000

Base controller
Rest controller
Hybrid controller
Template controller

Answered: How to check an Ajax request on the server?

Sun, 16 Jan 2022 19:05:05 +0000

Checking an Ajax request on the server is a task which can be done with the help of input class method. If there has been an Ajax request on the server, then the function, Input::is_ajax will return true, and in the otherwise case, it will return false.

Example

if (Input::is_ajax()) { // Ajax request } else { // Normal request }

Answered: How to create a validation object in FuelPHP?

Sun, 16 Jan 2022 19:03:30 +0000

1. Create an object.

2. Instantiate it, $val = Validation::forge('my_validation');

3. Start adding fields to it, $val = Validation::forge('my_validation');

4. Add username to it, $val->add('username', 'Your username')->add_rule;

5. Add column for password, $val->add('password', 'Your password')

->add_rule('required')

->add_rule('min_length', 3)

->add_rule('max_length', 10);

(The digits are as per the requirements)

6. Add the next field, the gender field- $val->add('gender', 'Your gender')-

>add_rule('required')

->add_rule('match_collection', array('M', 'F'));

If any other validations are to be given, then give them using add_rule() method.

Forge ( ) method is used for creating a validating objects, such as $val= Validation:: forge( );

Answered: What is Scaffolding in FuelPHP?

Sun, 16 Jan 2022 19:02:09 +0000

The term Scaffolding is a meta-data programming method needed for building database operations. The scaffolding of the concept FuelPHP which makes the work easy and helpful in allowing to get a basic CRUD application that too following simple and easy steps.

Answered: How to write the select query in FuelPHP Framework?

Sun, 16 Jan 2022 19:00:56 +0000

DB::select('name')->from('admin')->execute();

Answered: What is Presenter and how we can create Presenter in FuelPHP Framework?

Sun, 16 Jan 2022 18:59:38 +0000

A class containing logic is called as a presenter. It is useful for generating our view. A presenter can consist of database calls or the related retrievals but not perform any data manipulations.

Example

Creating Presenter is FuelPHP-

classPresenter_Index extends Presenter { // Body }

Answered: What is the Reserved Routes in FuelPHP Framework?

Sun, 16 Jan 2022 18:57:58 +0000

There are four reserved routes-

_403_-This route is followed at the time of uncaught HttpNoAccessException.
_root_-It is the default route to be followed due to the unspecified URI.
_404_-At the time of HttpNotFoundException, this route is followed.
_500_- Uncaught HttpServerErrorException leads to following this route.

Answered: What are the default security features provided by FuelPHP frameworks?

Sun, 16 Jan 2022 18:56:15 +0000

Encoding of the output
Input filtering
XSS filtering
Filtering of URLs
Prevention of SQL injection
CSRF token protection

Answered: What are the minimum requirements for installing the FuelPHP Framework?

Sun, 16 Jan 2022 18:54:23 +0000

The minimum PHP version is 5.3.3
installed and enabled Mbstringphp extension
Fileinfophp extension installed and enabled
PHPUnit version >=3.7 as per the requirement of running the unit tests.
Installed and enabled Mcryptphp extension.

Answered: What is HMVC in fuelPHP?

Sun, 16 Jan 2022 18:53:17 +0000

It is a Hierarchical Model-View-Controller framework used in FuelPHP providing the permission of requesting the internal controllers from the applications. It is a direct extension to the MVC pattern which helps in managing all the pre-defined scalability issues.

Answered: What are the template engines supported by FuelPHP Framework?

Sun, 16 Jan 2022 18:52:15 +0000

Mustache
Jade
Dwoo
Phptal
Markdown
Smarty
Twig
Haml

Answered: What are the advantages and disadvantages of FuelPHP?

Sun, 16 Jan 2022 18:51:05 +0000

Sparse documentation along with incomplete sections.
Somewhat complex structure to understand especially by PHP or Codeigniter developers at the beginners to intermediate level.
Small community and less number of applications built
Hard to learn the conventions of the naming space

Answered: What are the name the current Stable version of FuelPHP?

Sun, 16 Jan 2022 18:50:01 +0000

the updated version of FuelPHP, 1.8.2 was released. It contains improved functionalities, fixes the bugs, and several usual improvements.

Answered: What is FuelPHP and why it is used?

Sun, 16 Jan 2022 18:48:03 +0000

It is a web application framework and is an open source platform which works to execute HMVC pattern. The long list of the features of the technology is the answer to the above question.

The main traits which make FuelPHP framework user-friendly are-

Easy configuration
Enhanced usability
Provides authorized and authenticated framework
Increased portability
Ease of use in the server
Prevents SQL inject