Programming Leftovers

posted by Roy Schestowitz on Oct 27, 2022

Java

• Java Substring

  “The java substring is a part of the java main string. As the java strings are immutable, the initial string is left unchanged, and a new string is returned by this function. The new string is the substring from the string. To extract the desired substring using the substring method, we must provide the starting index and ending index as input. The substring returned from this method depends on the index value assigned to it.”

PHP

• Modern PHP features explained - PHP 8.0 and 8.1 | Laravel News

  Since its release in late 2020, PHP 8 has been a game changer. In this tutorial, I will walk through all the latest features with real-world examples of when I might choose to use them.

• Modern PHP features explained - PHP 8.0 and 8.1 (Laravel News) [LWN.net]

  Since its release, PHP 8 has been a game changer. In this tutorial, let's walk through all the latest features with real-world examples of when to use them.

Raku

• Don't fear the grepper! (4) - DEV Community

  The grep method allows one to filter a list of values: either a value gets through, or it does not. In this way, the functionality of grep is rather limited.

  What if you would not only like to filter out unwanted values, but also would like to adapt an acceptable value on the fly? Or turn a single value into multiple values? With the map method, you can!

  The map method provides a superset of the functionality of grep. But you can also use it as grep with a block to do the filtering (instead of using something to smart-match against).

  In many ways, understanding map well, will make understanding a lot of aspects of the Raku Programming Language a lot easier! So let's focus on that a bit.

  [...]

  This concludes the fourth part of the series, this time introducing the map method. And also introducing the concept of Empty, and Slip in general. And also showing that you can have a statement modifier version of if if you don't need an else or an elsif.!

  Questions and comments are always welcome. You can also drop into the #raku-beginner channel on Libera.chat, or on Discord if you'd like to have more immediate feedback.

Rust

• Bos: Do we need a "Rust Standard"? [LWN.net]

  Mara Bos has written a lengthy blog post on whether the Rust language needs to be standardized. The answer is "no" — but she draws a distinction between a "standard" (maintained by some distant standards body) and a "specification".

• Do we need a "Rust Standard"?

  Languages like C and C++ are standardized. They are fully specified in an internationally recognized standards document. Languages like Python, Swift and Rust do not have such a standards document.

  Should Rust be standardized? Why, or why not? In this blog post, I try to explain why I do think we need an accurate specification, why I do not think we need “standardization” (depending on your definition), and give an overview of the current state of Rust’s stability and specification efforts.

• This Week In Rust: This Week in Rust 466

  Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. This is a weekly summary of its progress and community. Want something mentioned? Tweet us at @ThisWeekInRust or send us a pull request. Want to get involved? We love contributions.

Standards/Consortia

• A Vulkanised Webinar: Exploring the Latest Updates to the Vulkan API and Ecosystem

• Updates from OpenCL Tooling Task Sub Group: Recently Upstreamed SPIR-V Backend Ready for Discussion at 2022 LLVM Developers’ Meeting

  OpenCL™ Tooling Task Sub Group (TSG) is actively contributing to the LLVM compiler infrastructure project and is determined to bring first-class support for OpenCL and SPIR-V™ to LLVM.

  While the latest release of Clang brought the long-awaited support for the OpenCL 3.0 standard, C++ for OpenCL 2021 kernel language, and the SPIR-V generation interface utilizing an external tool llvm-spirv from the SPIRV-LLVM-Translator repository, the work on the native GlobalISel-based SPIR-V backend continues at full speed.

Python

• Qt for Python: the 6.4.0.1 release, what?

  We regret to inform you that during the 6.4.0 release, we were attacked by release goblins.

Hardware

• WBZ451 Curiosity Board features Microchip PIC32CX-BZ2 BLE and Zigbee 3.0 microcontroller - CNX Software

  Microchip WBZ451 Curiosity Board features the company’s Microchip’s WBZ451PE Bluetooth Low Energy 5.2 and Zigbee 3.0 RF module based on the new Microchip PIC32CX-BZ2 32-bit Arm Cortex-M4F wireless microcontroller.

• Easily add face detection to your project with the Person Sensor module - CNX Software

  It’s now much easier to AI features to your project thanks to better tools, but as we’ve experienced when trying out Edge Impulse machine learning platform on the XIAO BLE Sense board, it still requires some effort and the learning curve may be higher than some expect.

  But for common tasks like face detection, there’s no reason for the solution to be hard-to-use or expensive, and Pete Warden (Useful Sensors) has designed the $10 Person Sensor fitted with a camera module pre-programmed with algorithms that detect nearby faces and reports the results over an I2C interface.

  [...]

  The module will also return identity information, or in other words, try to detect up to 8 different users, but this is not shown in the example above, and it’s not clear how well that works. You’ll find documentation and code samples in different languages including Arduino, CircuitPython, and Python on GitHub.