Understanding Inner workings of the Golang Channels — A goroutine is a lightweight user-space thread, which is managed by the Go runtime. It executes tasks concurrently, potentially in parallel. A channel is for communication between goroutines. In this post, we will delve into the inner workings of the channel and its send/ receive operations. Making Buffered channels Let’s first create a…

Confusion matrix, Accuracy, Precision, Sensitivity, Specificity, F1 score, and Roc curve, let’s remember them once for all — Despite having seen all these concepts more than a thousand times, I’m still getting confused sometimes. Is there a good way to think about all these concepts so that they start making sense? In this post, I will focus on how to remember them. …

Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs and geospatial indexes with radius queries. Redis is the world’s most popular in-memory data…

This post provides step-by-step instructions for upgrading Postgresql from version 9 to 13. Step 1: Create a backup of the existing Postgresql 9 database. Because the database server is running in AWS EC2, it’s recommended to use the AWS Volume Snapshot feature to create a backup of the whole volume that contains the database. …

Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. Here is the code to solve this problem. package main type MinStack struct { stack []int min []int } func NewMinStack() *MinStack { return &MinStack{stack: []int{}, min: []int{}} } // Push element x onto stack. func (s *MinStack) Push(x int)…

Most Dapp has a place to show the token balance of the user. How to get a single token balance for an address? It is actually very simple. You can refer to this post. How to Get Balance of an Ethereum Smart Contract Most Dapps provide users with a single place to view all their tokens and token balances, which helps them easily…jerryan.medium.com We have already known that the balanceof function of the ERC20 contract can help us to…

Most Dapps provide users with a single place to view all their tokens and token balances, which helps them easily identify and track their current holdings. How to get the balance of a token in a smart contract? It is easier than you think. Let’s see how to do it. Solution …

Using a contract address to find the NFT collection posted on Opensea is relatively simple. All you need to do is follow these steps: 1. Go to opensea.io 2. Enter a contract address into the search box, and the collection will be displayed on the page in a short period. …

Rust is a powerful programming language that is becoming increasingly popular for its efficiency and safety. Here are some tips to get you started on your journey to mastering Rust. Learning the Basics The best way to learn the basics of Rust is to work through the official Rust Book. …