Ruby Programming Language Quiz

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Questions and Answers

Which of the following is a more memory-efficient approach for defining options keys in a Rails controller?

Using Symbol keys

Using Integer keys

Using String keys (correct)

Using Float keys

What is the purpose of the `options` method in the `MyController` class?

To define routes for RESTful actions

To set option keys based on `available_option_keys` (correct)

To merge arrays of keys and values

To filter out non-option-key values from the `params` hash

What is the result of calling `y.keys` and `y.values` after executing the given code snippet?

Both will return an empty array

Both will return an array with three elements (correct)

Keys will return an array with three elements and values will return an array with nine elements

Both will return an array with one element

What is the naming convention for database tables in Rails?

Lowercase letters with underscores Signup and view all the answers

What is the purpose of ORM in Rails?

To map database tables to classes Signup and view all the answers

What is the naming convention for Models in Rails?

Mixed-case and singular Signup and view all the answers

What is the purpose of a Rails Controller?

To be the application's logical center Signup and view all the answers

What is the naming convention for classes and modules in Rails?

Uppercase letters with no spaces Signup and view all the answers

What is the purpose of the rakefile in Ruby?

To package and test code Signup and view all the answers

What is the difference between a class variable and an instance variable in Ruby?

Instance variables begin with @, class variables begin with @@ Signup and view all the answers

What is the difference between public, private, and protected access modifiers in Ruby?

Public allows all members to be modified, private restricts member access to functions within the class, and protected allows members to be accessed only by functions within the subclass Signup and view all the answers

What is the difference between string and text in Rails?

String can hold up to 255 characters, text can hold up to 30,000 characters Signup and view all the answers

What is the difference between load and require in Ruby?

Load is used to execute code, require is used to import libraries Signup and view all the answers

What is the purpose of Rails Active Record?

To connect Ruby code with database tables Signup and view all the answers

What is a Rails migration?

A tool for altering the database schema Signup and view all the answers

How does Rails protect against Cross-Site Request Forgery (CSRF)?

By including a hidden CSRF token in every form built using Rails form helpers Signup and view all the answers

What is the role of garbage collection in Ruby on Rails?

To manage memory usage by tracking which objects are in use by the program Signup and view all the answers

What command is used to create a migration in Rails?

rails generate migration table_name Signup and view all the answers

What is the difference between dynamic and static scaffolding in Rails?

Dynamic scaffolding generates content and user interface at runtime, while static scaffolding requires explicit entry in the command to produce data with fields. Signup and view all the answers

What are strong parameters in Rails?

Strong Parameters filter out unnecessary or potentially harmful parameters to enhance the security of data supplied through forms. Signup and view all the answers

What type of inheritance does Ruby support?

Ruby supports single inheritance, but offers a similar feature to multiple inheritance through mixins. Signup and view all the answers

What are some of the limitations of Ruby on Rails?

Ruby on Rails lacks foreign key support in databases, simultaneous connection to multiple databases, SOAP web services, and connection to multiple database servers simultaneously. Signup and view all the answers

What is the issue with converting user-supplied arguments to symbols in Ruby?

Symbols in Ruby are not garbage collected, which could potentially lead to a memory overload if an attacker submits many requests with random keys. Signup and view all the answers

Study Notes

Rails Controllers

In a Rails controller, defining options keys can be done in a memory-efficient way by using options.merge instead of redefining the entire options hash.

Options Method

The options method in a Rails controller class returns a hash of default options for the controller actions.

Hash Methods

y.keys returns an array of the hash keys, while y.values returns an array of the hash values.

Rails Conventions

Database tables in Rails follow the naming convention of being plural and in lowercase (e.g., users, articles).
Models in Rails follow the naming convention of being singular and capitalized (e.g., User, Article).
Classes and modules in Rails follow the naming convention of being capitalized (e.g., MyClass, MyModule).

Rails ORM

The purpose of Object-Relational Mapping (ORM) in Rails is to interact with the database using objects, rather than writing raw SQL code.

Rails Controller

The purpose of a Rails controller is to coordinate the interaction between the user, the views, and the models.

Rakefile

The purpose of a Rakefile in Ruby is to define tasks that can be executed from the command line.

Ruby Variables

A class variable in Ruby is shared by all instances of a class, while an instance variable is unique to each instance.

Ruby Access Modifiers

Public access modifiers in Ruby make methods publicly accessible.
Private access modifiers in Ruby make methods accessible only within the same class.
Protected access modifiers in Ruby make methods accessible within the same class and its subclasses.

Rails Data Types

The string data type in Rails is used for short strings, while the text data type is used for longer strings.

Ruby Loading

The require method in Ruby is used to load libraries, while the load method is used to load Ruby code files.

Rails Active Record

The purpose of Rails Active Record is to provide an interface to the database, allowing Ruby objects to be mapped to database tables.

Rails Migration

A Rails migration is a way to modify the database schema, allowing incremental changes to the database.

CSRF Protection

Rails protects against Cross-Site Request Forgery (CSRF) by generating and verifying a token for each request.

Ruby Garbage Collection

The role of garbage collection in Ruby on Rails is to automatically manage memory allocation and deallocation.

Rails Migration Command

The command to create a migration in Rails is rails generate migration.

Rails Scaffolding

Dynamic scaffolding in Rails generates code at runtime, while static scaffolding generates code at development time.

Rails Parameters

Strong parameters in Rails ensure that only permitted parameters are assigned to the model.

Ruby Inheritance

Ruby supports single inheritance, where a class can inherit from only one parent class.

Ruby on Rails Limitations

Some limitations of Ruby on Rails include performance issues with large applications and complexity in handling complex business logic.

Ruby Conversions

Converting user-supplied arguments to symbols in Ruby can lead to a denial-of-service vulnerability due to the creation of large symbol tables.

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Description

Test your knowledge of Ruby programming language with this quiz! Learn about defining variables, using load and require commands, and understanding access modifiers in Ruby. This quiz will test your understanding of key concepts and terminology used in Ruby programming. Whether you're a beginner or an experienced Ruby developer, this quiz will challenge your skills and help you improve your knowledge of the language.