Programming

When you hit the “Place Order” button, that event triggers a series of steps, including inventory reservation, payment processing, and shipping initialization. Now, suppose your card is charged by the payment service (Stripe 🤔), but the API call to the third-party shipping service failed. Modern systems don’t live inside a single database anymore. You can’t … Read more

For a durable Lambda function, standard errors at any step are checkpointed and handled during the next replay by retry-strategy configurations. However, there can be scenarios where a durable step starts execution but fails to complete, while also leaving no ERROR checkpoint behind. A common example is a Lambda execution timeout. In such cases, step … Read more

Some time ago, I was building a chat application using AWS Websocket API gateway. Things were going smoothly. I created a WebSocket API Gateway, added $connect, $disconnect, and sendMessage/addGroup routes. From the frontend (React) side, everything was fire-and-forget. You send a message, and the onMessageHandler takes care of it 💪🏼 But then a new requirement … Read more

Half star pyramid is the most common pattern which we come across while writing code to print patterns in any language. Take a look at this pattern:- *************** One approach that might come to mind is “ the number of stars in each row is equal to the number of row (I mean index of … Read more

In this post, we will see the difference between pure functions and high-order functions in javascript. What are Pure Functions in Javascript? Functions which does not produce side effect are called pure function. This means that it does not depend on any external variable (like global). Also, it does not modify any external variable. Such … Read more

useState is one of the first hooks I came across while learning React. It is easy to understand/use but equally fascinating/confusing at the same time ( just on click of a button, things update on-screen 😮).  Let’s dive in!!! Why useState Hook? React does not detect change in normal variables that’s why useState hook is required. … Read more