Redis is a in-memory key-value data store, and it used as a cache, counter, temporary data store and messaging pub/sub.Redis is mostly used component in modern web backend architecture. I will introduce common use cases that uses Redis as cache or messaging pub/sub.Cache, counter
When you write smart contracts in Solidity you will use modifier for each function that indicates accessibility for the functions.
In web application development, you’d face a moment that need to check websocket connection status.For example, you’d have a situation that your web backend needs to check if users are active in the browser. It’s as very simple as you just need to check websocket property WebSocket.readyState. It has 4 possible values; “CONNECTING”, “OPEN”, “CLOSING”, “CLOSE”. …
Hyperledger is recent promising project and DLT technology for blockchain adoption.
URL: https://www.algolia.com/ Algolia is a 3rd party service which provides intelligent search. It similar concept to elastic search. Here is an article which compares those 2 services. https://medium.com/@matayoshi.mariano/elasticsearch-vs-algolia-96364f5567a3
Hammer is a open-source library that can recognize gestures made by touch, mouse and pointerEvents. It doesn’t have any dependencies, and it’s small, only 7.34 kB minified + gzipped! Minified code (v2.0.8) Uncompressed code (v2.0.8) Changelog Browse the source on GitHub What’s new in 2.0?It’s completely rewritten, with reusable gesture recognizers, and improved support for the …
When you develop your web applications, you will have situation to test 3rd party API integration in the local development environment. The tricky problem here is most of 3rd party APIs are callback based. In a word, most of 3rd party APIs send data/status as callbacks/webhook to original client. However when you wants to test …
In real website coding, we are facing some challenges to create the complex gallery module in HTML or on the WordPress landing page sites. Fortunately, there are already pre-built libraries we can use or refer on, so we don’t need to waste our time to re-build them from scratch. Here are some of the image …
SQL injection: SQL injection is a code injection that might destroy your database. For example if there is an input box in the form name and button Search. When we click search button we send name parameter to the back-end and back-end executes a query like ‘SELECT * from user WHERE name=’ + name. But …