Question

Describe parameters x, y, and z in MongoClient.connect(x, {y}, z, { if (err) { ('Err ', err); } else { ("Connected successfully to server"); db = ('fi2095tabe'); } });

Option 1:
x: Database, ConnectionString, Options
y: Host, Port, Username, Password
z: Callback

Option 2 (Correct):
x: ConnectionString, Options, Callback
y: Host, Port, Database
z: Error

Option 3:
x: Host, Port, Database
y: ConnectionString, Options, Callback
z: Error

Option 4:
x: ConnectionString, Options, Host, Port
y: Database, Callback
z: Error

Answer 1

In MongoClient.connect(), 'x' represents the connection string, options, and callback function; 'y' typically involves host, port, and database, which are part of 'x'; 'z' is the error object in the callback that indicates whether the connection was successful or not.

Step-by-step explanation:

The parameters x, y, and z in the MongoClient.connect() function refer to different elements needed to establish a connection to a MongoDB database. The correct option is Option 2, where:

• x: ConnectionString, Options, Callback - This is the first argument that includes the connection string to the MongoDB instance, optionally followed by a set of options to configure the connection. The callback function is executed once the connection attempt is completed.
• y: Host, Port, Database - These parameters are typically part of the connection string in x and are not passed as separate parameters. They are used to specify the location of the database server, the port to connect on, and the database name to access.
• z: Error - This is part of the callback function's arguments, representing any error that occurred during the connection attempt.

Understanding these parameters is crucial when working with MongoDB in a Node.js environment, enabling developers to connect to the database and handle connection-related events properly.