10+ Patanjali Ayurved Interview Questions and Answers

Questions related to Java programming language concepts and SQL queries.

• final is a keyword used to declare a constant value, finally is a block of code that executes after a try-catch block

• static final is used to declare a constant value that can be accessed without creating an instance of the class, local variable has a limited scope within a method

• Deadlock occurs when two or more threads are blocked and waiting for each other to release resources, prevention can be done by ...read more

A mixin is a way to add functionality to a class without using inheritance. Ruby does not support multiple inheritance due to potential conflicts.

• Mixins in Ruby are achieved using modules, which can be included in classes to add methods and attributes.

• Ruby does not support multiple inheritance because it can lead to the diamond problem, where conflicting methods from different parent classes cause ambiguity.

• Instead of multiple inheritance, Ruby encourages the use of mixins an...read more

Hashing is a technique to map data to a fixed-size value. To retain unique elements in a collection, use a hash set.

• Create a hash set to store unique elements

• Iterate through the collection and add each element to the hash set

• If an element already exists in the hash set, skip adding it to retain only unique elements

Callbacks are methods that are called at certain points in an object's lifecycle. Destroy permanently deletes a record, while delete marks it as deleted.

• Validation callbacks are methods that are called before or after validations on an object. They are used to ensure data integrity.

• Destroy method permanently deletes a record from the database, including associated records. It does not trigger callbacks or validations.

• Delete method marks a record as deleted in the database, bu...read more

Many to many vs has and belongs to many association, and explanation of polymorphic association.

• Many to many association involves a join table to connect two models with a many-to-many relationship.

• Has and belongs to many association is a simpler version of many to many, where the join table is hidden.

• Polymorphic association allows a model to belong to more than one other model, using a single association.

• Example: Many to many - Students and Courses, HABTM - Users and Roles, ...read more

Proc is a block of code that can be reused, while lambda is an anonymous function.

• Proc is a saved block of code that can be called multiple times, while lambda is a one-time anonymous function.

• Procs are defined using the 'proc' keyword, while lambdas are defined using the 'lambda' keyword.

• Procs can take multiple arguments, while lambdas are limited to a single expression.

Questions related to OOPS, data structures, DBMS, and SDLC models.

• OOPS concept refers to the principles of object-oriented programming such as encapsulation, inheritance, and polymorphism.

• Array is a static data structure while linked list is a dynamic data structure.

• DBMS stands for Database Management System which is a software system used to manage and organize data.

• DDL (Data Definition Language) is used to define the database schema while DML (Data Manipulation Language) is...read more

Routes define URL patterns for mapping to controller actions in Rails. MVC architecture separates concerns in web development.

• Routes in Rails define URL patterns and map them to controller actions

• MVC architecture separates the application into Model, View, and Controller components

• Rails filters are methods that run before, after, or around controller actions

• Callbacks in Rails are methods that are run at certain points in an object's life cycle

• Custom validations in Rails allow...read more

Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.

• Variable and function declarations are hoisted to the top of their scope.

• Only declarations are hoisted, not initializations.

• Function declarations take precedence over variable declarations.

A closure is a function that has access to its own scope, as well as the scope in which it was defined.

• A closure allows a function to access variables from its outer function even after the outer function has finished executing.

• Closures are commonly used in JavaScript for data encapsulation and creating private variables.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }