BestPeers Infosystem Junior Software Developer Interview Questions, Process, and Tips

Q1. Difference between proc and lambda
Ans. 
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.
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Q2. What is mixin and does ruby support multiple inheritence if yes then how and no then why?
Ans. 
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 ...read more
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Q3. What are and validations callbacks and difference between destroy and delete
Ans. 
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.

• D...read more
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Q1. Difference between many to many and has and belongs to many association and explain polymorphic association
Ans. 
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...read more
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Q2. What is hash and coding problem to retain only unique elements in a collection
Ans. 
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
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Q3. Tell me about project and some implementation related question for that
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Some aptitude question with 3 coding question were asked on string and array

Q1. Recruiter gone through resume first and then all the technical question were asked beyond resume also asked about DBMS, deadlock, pointers, strong core concept on language
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Q2. What is final finally and difference? what is static final and scope of local variable? what is deadlock and method to prevent? is java fully or partial object oriented if partial then why? all oops concep...read more
Ans. 
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 e...read more
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Q1. About family bg. what is your interest. what are the project any other platform for coding you use and what is the score in that
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