Modern structuredClone() is less performant because it is more capable than JSON.parse(JSON.stringify()) — Copying or cloning objects is a common operation in the code of web applications. It might be needed, for example, for displaying filtered data while preserving the data loaded from the server. Two techniques can be used for cloning objects. One way is to use JSON.parse(JSON.stringify()) to convert the object…

What is the best way to load relational data — JDBC or JPA? — Usually web applications serve to save data to a database and to visualize already saved data. What is the best way for a Java application to interact with a database? There are two options — JDBC or a library implementing JPA. Instead of speculating, I make a simple realistic experiment. …

Use methods names to delimit output of unit tests — When a piece of code is perfect and its tests always pass, the output of the never failing tests does not matter. It is enough to see in the test report that the tests have passed. But for development or improvement of fresh code and its tests, the legible output…

Import contents into Confluence through the user interface using a Puppeteer-controlled browser — What are the options if you have to copy some somewhere existing contents into Confluence? Suppose you would not like to spend time on a boring task of creating pages and pasting the contents. In addition to the ways described in the Confluence documentation, you could automate creating pages and…

Everyone uses filter(), but have you ever used complementary methods dropWhile() and takeWhile()? They can simplify text extraction from formatted documents — The nicest feature of Java language What Java language feature do you like most? Streams stand out in the verbose syntax of Java. var keyword is also relieving. Streams can be regarded as a special form of a loop. In some cases stream syntax results in a code that is shorter than an equivalent for-loop-based code…

Easy session management with Express and Node.js — Passwords annoy users and complicate life of developers. Decent websites provide a possibility to log in with some social identity provider. In this post I use two modern options of sign in with Google to demonstrate that with Node.js web development is relatively easy. With Express library it is easy…

Differences, advantages and disadvantages in two easy ways of streaming data from a server — Normally a web page requests data from a server. But sometimes it is needed that the server keeps sending data to a browser whenever it has something to send and not only when when the browser makes a request. For example, if a web page displays a live log of…

The server-side code protecting from CSRF attacks is doomed to extinction — Cookies are typically used to keep users logged into websites. Previously cookies were sent with any requests. For example, the browser used to send the cookies when a web site requested an image from another web site or with a POST request to another website. This feature of cookies was…

Do you really have to disable console.log() in production? — There are debuggers. But for some developers, it is easier to see the complete picture in the application log. Somehow it is believed that it is fine for a server-side to keep a log, but it is uncommon to see a detailed log on the client-side. Why? Among many abstract…