Inncircles Technologies Interview Questions and Answers

Use the built-in reverse() method to reverse an array in JavaScript.

• Use the reverse() method on the array to reverse its elements in place.

• Example: let arr = ['apple', 'banana', 'cherry']; arr.reverse(); // ['cherry', 'banana', 'apple']

I would choose MongoDB for its flexibility and scalability in handling unstructured data.

• MongoDB is a NoSQL database, making it easier to work with unstructured data compared to MySQL which is a relational database.

• MongoDB is highly scalable and can handle large amounts of data and high traffic loads.

• MongoDB is a good choice for applications that require frequent updates and real-time analytics.

• MySQL is a better choice...read more

Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web applications.

• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing direct manipulation of the actual DOM.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to identify the minimal number of updates needed.

• This approach reduces the number of DOM ...read more

Foreign key in SQL is a field in a table that is a primary key in another table, establishing a relationship between the two tables.

• A foreign key constraint ensures referential integrity between two related tables.

• It helps maintain consistency and avoid orphan records.

• Example: In a database with tables 'orders' and 'customers', the 'customer_id' in 'orders' table can be a foreign key referencing the 'id' column in 'cus

Props are read-only properties that are passed from a parent component to a child component in React.

• Props allow data to be passed down the component tree.

• Props are immutable and cannot be changed by the child component.

• Props are accessed in the child component using this.props.