Ernst & Young Technical Consultant Interview Questions and Answers

Integrating native code with JavaScript allows for enhanced performance and access to system-level features.

• Native code can be integrated using WebAssembly for performance-critical applications.

• JavaScript can call native functions through APIs like Node.js's 'ffi' (Foreign Function Interface).

• In mobile development, frameworks like React Native allow integration with native modules for iOS and Android.

• Example: Usin...read more

A cursor is a database object used to retrieve, manipulate, and navigate through a result set row by row.

• Cursors allow for row-by-row processing of SQL query results.

• They are useful for operations that require complex logic on each row.

• Example: Using a cursor to update records in a loop based on certain conditions.

• Cursors can be explicit (defined by the user) or implicit (automatically created by the database).

• Per...read more

An index is a data structure that improves the speed of data retrieval operations on a database table.

• Indexes are used to quickly locate data without having to search every row in a table.

• They can be created on one or more columns of a table, e.g., an index on the 'last_name' column in a 'users' table.

• Indexes can significantly enhance performance for read-heavy operations, such as SELECT queries.

• However, they can ...read more

A trigger is an event or condition that initiates a specific action or response in a system or process.

• Triggers can be found in databases, where they automatically execute a predefined action when certain conditions are met.

• For example, a database trigger can update a record when a new entry is added to a table.

• In programming, triggers can refer to events that start functions, such as a button click triggering a r...read more

Collection is a framework in Java that provides an architecture to store and manipulate a group of objects.

• Collection is an interface that extends Iterable interface

• List, Set, and Queue are the main subinterfaces of Collection

• ArrayList, LinkedList, HashSet, and TreeSet are some of the implementations of Collection

• Collection provides methods like add(), remove(), contains(), size(), and clear()

• Collections is a clas...read more