Impressico Business Solutions Front end Developer Interview Questions and Answers for Experienced

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Q1. Puzzle , sql related questions
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Q1. What is Connection pooling
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Connection pooling is a technique to manage database connections efficiently, reducing overhead and improving performance.
• Connection pooling maintains a pool of active database connections for reuse.

• It reduces the overhead of establishing a new connection for each database request.

• Example: A web application can reuse connections from the pool instead of opening new ones for each user request.

• Connection pools can be con...read more
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Q2. What is mounting in docker
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Mounting in Docker allows you to share files between the host and containers, enabling data persistence and configuration management.
• Mounting can be done using volumes or bind mounts.

• Volumes are managed by Docker and are stored in a part of the host filesystem which is not directly accessible.

• Example of a volume: `docker run -v my_volume:/data my_image`.

• Bind mounts allow you to specify an exact path on the host, e.g., ...read more
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Q3. What is decorators
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Decorators are a design pattern in Python that allows modifying the behavior of functions or methods at runtime.
• A decorator is a function that takes another function and extends its behavior without explicitly modifying it.

• Common use cases include logging, access control, and caching.

• Example: @staticmethod and @classmethod are built-in decorators in Python.

• Custom decorators can be created using nested functions.

• Example...read more
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Q4. Shell script question
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It was basics on java and big data

Q1. Java c++ coding question
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The interviewer asked about javascript basics and DSA questions and some typescript questions

Q1. Closures, hostings, react js, redux, hooks basic
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Q2. Html5, css3, basic javascript stuff
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It was mostly on JavaScript

Q1. Focused on react
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Q1. Brief about project
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Cover topics like closures, classes, functions

Q1. Explain call bind apply
Ans. 
Call, bind, and apply are methods used to manipulate the value of 'this' in JavaScript functions.
• Call: Invokes a function with a specified 'this' value and arguments provided individually.

• Example: func.call(thisArg, arg1, arg2)

• Bind: Creates a new function that, when called, has a specified 'this' value and arguments provided one by one.

• Example: var newFunc = func.bind(thisArg, arg1, arg2)

• Apply: Invokes a function with ...read more
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Q2. Explain closures
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Closures are functions that have access to variables from their containing scope even after the scope has closed.
• Closures allow functions to access variables from their outer function even after the outer function has finished executing.

• They help in maintaining state in asynchronous operations.

• Closures are commonly used in event handlers and callbacks.
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