Dataman Computer Systems Node JS Developer Interview Questions and Answers

Basic aptitude assessment along with some theoretical components.

Q1. Basic questions in Java, SQL and React
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Q1. Project related questions
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Q2. Coding question->Reverse String(World Hello), pattern, prime number
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Q1. Write a program for factorial of a number using for loop?
Ans. 
Program to calculate factorial of a number using for loop
• Initialize a variable to store the factorial result

• Use a for loop to iterate from 1 to the given number

• Multiply the current value with the factorial result in each iteration

• Return the factorial result
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Give 10 questions from node js backend

Q1. Ask about angular and node js
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Q2. What is package.json
Ans. 
package.json is a file used in Node.js projects to manage dependencies, scripts, and metadata.
• It is a JSON file that contains information about the project, such as name, version, dependencies, and scripts.

• It is used to manage project dependencies by listing them in the 'dependencies' and 'devDependencies' fields.

• It allows developers to define scripts for tasks like building, testing, and running the project.

• Example: {...read more
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Q3. What is components in angular,how share data to component
Ans. 
Components in Angular are building blocks of an application. Data can be shared between components using input properties and output events.
• Components in Angular are reusable, self-contained units of code that define a part of the user interface.

• Data can be shared to a component using input properties, where data is passed from the parent component to the child component.

• Data can also be shared from a child component t...read more
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Q4. What is === and == ,and wher use === is real time projects
Ans. 
=== is strict equality operator, while == is loose equality operator. === is commonly used in real-time projects for accurate comparisons.
• === is a strict equality operator that checks both value and type of operands

• == is a loose equality operator that only checks the value of operands

• === is commonly used in real-time projects to ensure accurate comparisons and prevent unexpected type coercion issues
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Q5. Write arrow function syntax
Ans. 
Arrow function syntax in JavaScript
• Arrow functions are concise syntax for writing function expressions in JavaScript

• They have a shorter syntax compared to traditional function expressions

• They do not have their own 'this', 'arguments', 'super', or 'new.target' keywords
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Q6. What is difference between arrow function and anonymous function
Ans. 
Arrow functions are concise syntax for writing function expressions, while anonymous functions do not have a name.
• Arrow functions have a shorter syntax compared to anonymous functions.

• Arrow functions do not have their own 'this' keyword, while anonymous functions do.

• Arrow functions do not have 'arguments' object, while anonymous functions do.

• Arrow functions are not hoisted, while anonymous functions are hoisted.
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Aptitude questions with some basic coding questions

They have given 3 coding questions and some pseudo codings

Q1. Tell about your self
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Q2. Some coding questions
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Logical thinking and quantitative

One Java and one SQL and one js question

Q1. What is collections
Ans. 
Collections are data structures that store and organize multiple elements in a single unit.
• Collections provide methods to add, remove, and manipulate elements.

• Examples of collections include arrays, lists, sets, and maps.

• Collections can be used to efficiently manage and access large amounts of data.
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Q2. What is constructor
Ans. 
A constructor is a special method in a class that is automatically called when an object of that class is created.
• Constructors have the same name as the class they belong to

• They are used to initialize the object's state

• Constructors can have parameters to customize the initialization process
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Q3. What is data science
Ans. 
Data science is a field that uses scientific methods, algorithms, and systems to extract knowledge and insights from structured and unstructured data.
• Data science involves collecting, analyzing, and interpreting large amounts of data to make informed decisions.

• It combines statistics, machine learning, and domain knowledge to uncover patterns and trends in data.

• Data scientists use programming languages like Python and R...read more
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Logical reasoning and Aptitude

Functions with Pointers and strings concepts

Q1. Mainly on Pointers and Dynamic Memory Allocation of 2-D Array
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Q2. Structure Padding and Packing
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Q1. Scenario based questions asked
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