Polyfill is basically used to provide more functionality to the older browsers like IE. Say there are some functions like map which are available in all modern browsers but not available in IE. For example, we have a code that uses a map, filter, find, reduce, etc but now if…

What is Kafka? Kafka is distributed message streaming platform that uses publish and subscribe mechanism to stream the records. It was developed by LinkedIn and then donated to the Apache foundation. Kafka is open source. Let's understand the terms distributed and message streaming, Distributed Vs Centralized Centralized — All the data is stored in a central…

Promises are used to handle the async operations in JS. Prior to this, we had callbacks to handle the async operations but that had its own drawbacks like callback hell, etc. Promises are the async operations that may be resolved or rejected based on certain conditions. …

It forms a transparent layer between the operations on a javascript object i.e it enables you to intercept and customize the operations performed on the object. Proxy objects are commonly used to log property accesses, validate, and format object requests. let objProxy = new Proxy(Object, handler_function) object: the original object…

Redux is a state management library used to manage the application state in react. It can be used when prop drilling needs to be avoided. If the application is small we can pass the state from the parent component to the child component using the props but what if our…

What are prototypes? — Prototypes are the mechanism by which objects inherit the features of one object in another object. It is a special object that is attached to every object in JS. Basically, Prototypes enable the user to use the OOPS — Inheritance concept in core Javascript(Not talking about the ECMA Script). Now…

We will be understanding the basics of Redis, set up in a local machine, and compare the results of endpoint(API) created with Redis and without Redis. What is Redis? Redis is an open-source, in-memory data structure. In-memory means all the data we store in Redis is not stored in any physical hard drive…

Let discuss about how an chat application works and how can we scale the application so that there may be millions of users. Let us write down our requirements from application, Functional Requirements. One to one messaging — User A should be send private message to User B. Sent/Delivered/Seen Message…

What is OAuth? — OAuth is an open-standard authorization protocol or framework that describes how unrelated servers and services can safely allow authenticated access to their assets without actually sharing the initial, related, single logon credential. In authentication parlance, this is known as secure, third-party, user-agent, delegated authorization. Let’s understand with an example, You…