Top sharechat interview questions

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Real interview questions from Sharechat company. Includes theoretical concepts and coding problems.

What are the key features of JavaScript that make it suitable for client-side scripting?

How does React handle state changes and component updates?

What is the difference between a monolithic architecture and a microservices architecture?

How does Node.js handle asynchronous operations and callbacks?

What are the benefits of using a containerization platform like Docker?

How does a load balancer distribute traffic across multiple servers?

What is the purpose of a Content Delivery Network (CDN)?

How does a caching mechanism like Redis improve system performance?

What are the key considerations when designing a database schema?

How does a message queue like RabbitMQ handle message processing and delivery?

What are the benefits of using a cloud-based platform like AWS?

How does a monitoring tool like Prometheus monitor system performance and alert on issues?

What are the key considerations when implementing security measures in a web application?

How does a logging mechanism like ELK (Elasticsearch, Logstash, Kibana) handle log collection and analysis?

What are the benefits of using a version control system like Git?

How does a continuous integration and continuous deployment (CI/CD) pipeline improve software development and delivery?

What are the key considerations when designing a RESTful API?

Write a JavaScript function to reverse a string.

function reverseString(str) {
  return str.split('').reverse().join('');
}

Write a JavaScript function to find the maximum value in an array.

function findMax(arr) {
  return Math.max.apply(null, arr);
}

Write a JavaScript function to implement a simple cache using a Map.

function Cache() {
  this.cache = new Map();
}
Cache.prototype.get = function (key) {
  return this.cache.get(key);
};
Cache.prototype.set = function (key, value) {
  this.cache.set(key, value);
};

Write a JavaScript function to merge two sorted arrays into a single sorted array.

function mergeSortedArrays(arr1, arr2) {
  return [...arr1, ...arr2].sort((a, b) => a - b);
}

Write a JavaScript function to find the first duplicate in an array.

function findFirstDuplicate(arr) {
  const seen = new Set();
  for (let i = 0; i < arr.length; i++) {
    if (seen.has(arr[i])) {
      return arr[i];
    }
    seen.add(arr[i]);
  }
  return null;
}

Write a JavaScript function to implement a simple queue using an array.

function Queue() {
  this.queue = [];
}
Queue.prototype.enqueue = function (item) {
  this.queue.push(item);
};
Queue.prototype.dequeue = function () {
  return this.queue.shift();
};