Synamedia Node Js Backend Developer Interview Questions, Process, and Tips

This assignment involved API design, encompassing multiple topics, and included the requirement to write test cases. The focus was on an Event Ticket Reservation System.

Q1. Can you demonstrate inheritance in JavaScript?
Ans. 
Yes, inheritance in JavaScript is achieved through prototype chaining.
• In JavaScript, objects can inherit properties and methods from other objects through prototype chaining.

• The prototype property allows objects to inherit properties and methods from another object.

• Child objects can access properties and methods of their parent objects through the prototype chain.

• Example: function Animal() {} Animal.prototype.eat = fun...read more
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Q2. What is function overriding, and how is it implemented in JavaScript?
Ans. 
Function overriding is a concept where a subclass provides a specific implementation of a method that is already provided by its superclass.
• In JavaScript, function overriding can be achieved by defining a method in a subclass with the same name as a method in its superclass.

• When an object of the subclass calls the overridden method, the subclass's implementation is executed instead of the superclass's.

• This allows for c...read more
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Q3. What are the steps to create a basic POST API that handles all possible errors? What is marshalling? Also write test cases for api. Discuss all http status codes you know.
Ans. 
Creating a basic POST API with error handling, marshalling, test cases, and HTTP status codes.
• Create a Node.js server using Express framework

• Define a POST route that handles incoming requests

• Implement error handling using try-catch blocks

• Use marshalling to convert data between different formats (e.g. JSON to object)

• Write test cases using a testing framework like Mocha and Chai

• HTTP status codes: 200 (OK), 400 (Bad Reque...read more
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Q4. What is the process to create a basic connection to MongoDB?
Ans. 
To create a basic connection to MongoDB, you need to install the MongoDB driver, set up a connection string, and use the MongoClient to connect to the database.
• Install the MongoDB driver using npm install mongodb

• Set up a connection string with the MongoDB URI

• Use the MongoClient to connect to the database
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Q5. Given an array, how can you determine the frequency of a specific element and subsequently delete all occurrences of that element?
Ans. 
Use JavaScript methods to determine frequency and delete all occurrences of a specific element in an array of strings.
• Use the reduce method to count the frequency of the specific element in the array.

• Use the filter method to remove all occurrences of the specific element from the array.
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