Top 10 Ruby interview questions and answers for 2022

This is an important Ruby interview question. Ruby is recognized as a flexible language since it allows its author to change the programming parts. Some aspects of the language can be deleted or redefined. Ruby does not impose any limitations on the user. To add two numbers, for example, Ruby allows you to use the + sign or the word 'plus'. This modification is possible using Ruby's built-in class Numeric.

Load and need are both used in Ruby to load available code into the current code. It is recommended to use 'load' when the code must be loaded every time it is altered or when someone visits the URL. It is recommended to use 'require' in the case of autoload.

This is an important Ruby interview question.

• Variables: All letters are lowercase while declaring Variables, and words are separated by underscores.
• Module and Class: Modules and Classes are written in MixedCase with no underscores; each word begins with an uppercase letter.
• The table in the database: The database table name should have lowercase letters and underscores between words, and all table names should be plural, for example, invoice items.
• Model: It is represented as unbroken MixedCase with singular with the table name.
• Controller: Controller class names are written in plural form, so OrdersController is the controller for the order table.

Rails include numerous features such as:

• Meta-programming: Rails uses code generation, but meta-programming is used for heavy lifting. Ruby is regarded as one of the best meta-programming languages.
• Active Record: It uses the Active Record Framework to save objects to the database. Using metaprogramming, the Rails version of Active Record identifies the column in a schema and automatically connects it to your domain objects.
• Scaffolding: Rails may automatically generate scaffolding or interim code.
• Rails, unlike other development frameworks, do not require much configuration if you strictly adhere to the naming standard.
• Rails include three environments by default: testing, development, and production.
• Built-in testing: It supports code known as harness and fixtures, which allow test cases to be written and executed.

This is an important Ruby interview question.

• App/controllers: The Controller handles a user's web request. Rails look for controller classes in the controller subdirectory.
• App/helpers: Any helper classes needed to assist the view, model, and controller classes are stored in the helper's subdirectory.

In the following ways, the symbol differs from the variables.

• It is more akin to a string than a variable.
• A string in Ruby is mutable, while a symbol is not.
• There is only one duplicate of the symbol that has to be produced.
• In Ruby, symbols are frequently used to correlate to enums.

This is an important Ruby interview question. Rails Migration can do the following things:

• Create table
• Rename column
• Change column
• Remove column
• Drop table
• Rename table
• Add column

Rake is a Ruby Make; it is a Ruby utility that replaces the Unix utility 'make' and builds a list of tasks using a 'Rakefile' and '.rake files'. Rake is used in Rails for routine administration activities such as database migration via scripts, schema loading into the database, and so on.

This is a common Ruby interview question. The Rails controller serves as the application's logical heart. It makes the interaction between users, views, and the model easier. It also does other tasks such as:

• It can route external requests to internal actions. It is highly adept at handling URLs. It governs helper modules, which extend the capabilities of view templates without bloating their code.
• It manages sessions, which give consumers the sense that they are interacting with our applications in real-time.

Rails Observers: Similar to Callback, Observers are used when the method is not directly related to the object lifecycle. In addition, the observer has a longer lifespan and can be detached or attached at any time. For example, displaying model values in the UI and updating the model based on user input.

Rail Callback: This method can be called at specific points in an object's life cycle, such as when an object is validated, created, updated, or removed. A callback is a short-lived method. For example, consider operating a thread and providing a call-back function that is invoked after the thread terminates.