Progressive Infotech Service Advisor Interview Questions and Answers

Q1. 1.polyfill map, currying vs closure, reduce method, explain this?, 2.what is lazyload and suspense, single thread vs multi thread, Event loop(task queue & microtask queue)?
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Q2. Explain redux? Redux vs context api? ES6 features? Rest vs Spread? null vs undefined?
Ans. 
Redux is a predictable state container for JavaScript apps.
• Redux is a state management library for JavaScript applications.

• It helps in managing the state of an application in a predictable way.

• Redux follows a unidirectional data flow pattern.

• Context API is a built-in feature of React that can be used for state management, but it is not as powerful as Redux.

• ES6 features include arrow functions, template literals, destru...read more
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Output based question regarding shallow and deepcopy related to object.
write a program for i/p: "This is the JS guide, developer!" o/p: "sihT si eht SJ ,ediug !repoleved"
react timer based output start, stop and reset.

Q1. Oops concepts, lots of java
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Q2. In depth about Microservices
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Q3. About why I want to join
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Q1. Asked about Java,spring MVC,code snippets asked foroutput
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Q1. About rest template angular spring boot
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Q1. This round is withmanager about technical
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Q1. Salary discussion with hr policies
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Q1. No round was happened
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Q1. Wat is singleton class, difference bw hashmap and concurrent hashmap
Ans. 
Singleton class is a class that can only have one instance, while HashMap is not thread-safe but ConcurrentHashMap is.
• Singleton class restricts instantiation to one object, ensuring a single instance throughout the application.

• HashMap allows multiple threads to access and modify it concurrently, which can lead to data corruption in a multi-threaded environment.

• ConcurrentHashMap is thread-safe and allows multiple thread...read more
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Q1. Had questions related to data structures
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Q1. Related to work culture and salary related details
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Q1. Java hash map and how it works
Ans. 
Java hash map is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values based on keys.
• HashMap in Java implements the Map interface and allows null keys and values.

• It uses hashing to store and retrieve key-value pairs, providing O(1) time complexity for get() and put() operations.

• Example: HashMap<String, Integer> map = new HashMap<>(); map.put("key", 1); int value = map.
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