Trawex Technologies Application Developer Interview Questions and Answers

Q1. Let var const difference
Ans. 
var, let, and const are all used to declare variables in JavaScript, but they have different scopes and mutability.
• var is function-scoped and can be redeclared and reassigned

• let is block-scoped and can be reassigned but not redeclared

• const is block-scoped and cannot be reassigned or redeclared
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Q2. Polyfills of bind method
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Polyfills of bind method provide a way to use the bind method in older browsers that do not support it natively.
• Polyfill code typically checks if the bind method is available and if not, it creates a new function that mimics the behavior of bind.

• One common polyfill for the bind method is the following: Function.prototype.bind = Function.prototype.bind || function() { // polyfill code here };

• Polyfills are often used to ...read more
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Q1. Make a search bar in React
Ans. 
Create a search bar component in React for filtering data
• Create a functional component for the search bar

• Use state to store the search query

• Implement a onChange event handler to update the search query

• Filter the data based on the search query
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Q2. React js core concepts
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Q1. How you structure your work
Ans. 
I structure my work by breaking down tasks, setting priorities, creating timelines, and regularly reviewing progress.
• Break down tasks into smaller, manageable chunks

• Set priorities based on deadlines and importance

• Create timelines to track progress and ensure timely completion

• Regularly review progress and adjust plans as needed
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Q2. How you make a project from scratch
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To make a project from scratch, start by defining requirements, creating a plan, designing the architecture, implementing the code, testing, and deploying.
• Define project requirements and goals

• Create a project plan with timelines and milestones

• Design the architecture of the project, including database schema and system components

• Implement the code following best practices and coding standards

• Test the project thoroughly ...read more
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Q1. Resume based questions
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Q2. Event loop in nodejs
Ans. 
Event loop in Node.js manages asynchronous operations by executing callback functions when certain events occur.
• Event loop is responsible for handling I/O operations, timers, and callbacks in Node.js

• It allows Node.js to perform non-blocking operations efficiently

• Event loop continuously checks the event queue for new events to execute
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Q3. Javascript es6 questions
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Q1. Promises in javascript
Ans. 
Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.
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Discussion on experience and current role and responsibilities

Q1. 1. Discuss one past project
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Q2. 2. Design a job scheduler
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A job scheduler is a software application that manages the scheduling of tasks or jobs to be executed by a computer system.
• Define the job scheduling requirements such as priority, deadline, resource constraints, etc.

• Implement a scheduling algorithm like First Come First Serve, Shortest Job First, Round Robin, etc.

• Maintain a queue of jobs to be executed and allocate resources accordingly.

• Monitor job execution and handle...read more
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Q1. Introduction about your self
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Q2. About your knowledge
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3 DSA questions on array and strings 1 easy, 2 medium level

Create django backend project for book store

Q1. Behaviour and Situations questions
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Q1. C# , oops & mvc. Be clear with basic concepts
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Q2. What is the four pillars of oops
Ans. 
The four pillars of OOP are Abstraction, Encapsulation, Inheritance, and Polymorphism.
• Abstraction: Hiding implementation details and showing only necessary information.

• Encapsulation: Binding data and functions that manipulate it together.

• Inheritance: Creating new classes from existing ones, inheriting their properties and methods.

• Polymorphism: Ability of objects to take on multiple forms or behaviors.
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Q3. What is mvc and how it helps the developers
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MVC stands for Model-View-Controller. It is a software design pattern that separates an application into three interconnected components.
• Model represents the data and business logic of the application

• View is responsible for rendering the user interface

• Controller handles user input and updates the model and view accordingly

• MVC helps developers to write clean, modular and maintainable code

• It also enables parallel develop...read more
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