Node.js, often referred to as simply "Node," is a powerful open-source runtime environment that allows developers to execute JavaScript code outside of web browsers. It is designed for building scalable and efficient network applications, particularly on the server side. Node.js leverages a non-blocking, event-driven architecture, making it ideal for handling asynchronous operations and real-time applications. With its vast ecosystem of packages and modules available through npm (Node Package Manager), Node.js has become a popular choice for web development, microservices, APIs, and more, enabling developers to create high-performance applications with ease.
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Practice Test
111. Which Node.js module is commonly used for connecting to MySQL databases?
A. mongo
B. mysql
C. postgresql
D. mongoose
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Answer: mysql
112. What is the primary purpose of the mysql module in Node.js?
A. To create HTML templates
B. To manage hardware devices
C. To establish a connection to a MySQL database and perform database operations
D. To handle client-side rendering
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Answer: To establish a connection to a MySQL database and perform database operations
113. In Node.js, what is the typical way to establish a connection to a MySQL database using the mysql module?
A. By calling the mysql.connect() method
B. By specifying the database connection details in a JavaScript file
C. By using the mysql.createConnection() method and passing connection options
D. By defining a new MySQL class
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Answer: By using the mysql.createConnection() method and passing connection options
114. Which Node.js module is commonly used for connecting to MongoDB databases?
A. mongo
B. mysql
C. mongodb
D. mongoose
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Answer: mongodb
115. What is Mongoose in the context of Node.js and MongoDB?
A. A type of fruit
B. A popular template engine
C. An Object-Relational Mapping (ORM) library for MongoDB
D. A built-in MongoDB module
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Answer: An Object-Relational Mapping (ORM) library for MongoDB
116. What is an Object-Relational Mapping (ORM) library used for in Node.js and database connectivity?
A. To create static HTML templates
B. To manage hardware devices
C. To provide an abstraction layer that simplifies database operations by mapping database entities to JavaScript objects
D. To establish network connections
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Answer: To provide an abstraction layer that simplifies database operations by mapping database entities to JavaScript objects
117. Which Node.js module is commonly used for connecting to PostgreSQL databases?
A. mongo
B. mysql
C. postgresql
D. pg
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Answer: pg
118. What is the primary purpose of the pg module in Node.js?
A. To create HTML templates
B. To manage hardware devices
C. To establish a connection to a PostgreSQL database and perform database operations
D. To handle client-side rendering
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Answer: To establish a connection to a PostgreSQL database and perform database operations
119. In Node.js, how is the connection to a PostgreSQL database typically established using the pg module?
A. By calling the pg.connect() method
B. By specifying the database connection details in a JavaScript file
C. By using the pg.createConnection() method and passing connection options
D. By defining a new PostgreSQL class
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Answer: By specifying the database connection details in a JavaScript file
120. In MongoDB, what is a document in the context of database connectivity?
A. A physical data storage unit
B. A structured query language
C. A JSON-like data structure used to store and retrieve data
D. A client-side JavaScript file
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Answer: A JSON-like data structure used to store and retrieve data
