100+ Smile Automation Interview Questions and Answers

Reverse a string using array manipulation

• Create an array of characters from the input string

• Iterate through the array in reverse order and append each character to a new string

• Return the reversed string

Inheritance in Java allows a class to inherit properties and behaviors from another class.

• Allows a class to reuse code from another class

• Creates a parent-child relationship between classes

• Child class inherits fields and methods from parent class

• Can have multiple levels of inheritance

• Example: class Dog extends Animal

Various types of DB include relational, non-relational, distributed, graph, and time-series databases.

• Relational databases store data in tables with rows and columns (e.g. MySQL, PostgreSQL)

• Non-relational databases store data in key-value pairs, documents, or wide-column stores (e.g. MongoDB, Cassandra)

• Distributed databases spread data across multiple servers for scalability and fault tolerance (e.g. HBase, Riak)

• Graph databases use graph structures for data storage and queryi...read more

useCallback is a React hook that returns a memoized callback function

• Returns a memoized callback function

• Helps optimize performance by preventing unnecessary re-renders

• Useful when passing callbacks to child components

PL/SQL is a procedural language extension for SQL in Oracle databases.

• PL/SQL stands for Procedural Language/Structured Query Language.

• It is used to create stored procedures, functions, triggers, and packages in Oracle databases.

• PL/SQL code is executed on the server side, providing better performance compared to SQL statements executed on the client side.

Reverse a given string

• Use a loop to iterate through the string and append each character to a new string in reverse order

• Alternatively, use built-in string functions to reverse the string

• If the string is stored as an array of characters, swap the first and last elements, then the second and second-to-last elements, and so on until the middle is reached