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Scala List class: methods, examples, and syntax

This page contains a large collection of examples of how to use the methods on the Scala List class.

The Scala List class as an immutable, linear, linked-list class. It’s very efficient when it makes sense for your algorithms to (a) prepend all new elements, (b) work with it in terms of its head and tail elements, and (c) use functional methods that traverse the list from beginning to end, such as filter, map, foldLeft, reduceLeft.

Scala Seq class: methods, examples, and syntax

This page contains a large collection of examples of how to use the methods on the Scala Seq class.

Important note about Seq, IndexedSeq, and LinearSeq

As an important note, I use Seq in the following examples to keep things simple, but in your code you should be more precise and use IndexedSeq or LinearSeq where appropriate. As the Seq class Scaladoc states:

How to install and remove Drupal 8 modules at the command line with Composer

I find Drupal 8 module management to be confusing, but one thing I’ve learned is that you can install and remove Drupal 8 modules with Composer at the command line.

Adding a Drupal 8 module with Composer

The short story is that to add a new module — such as the reCAPTCHA anti-spam module — you type this command at the command line (in the root directory of your Drupal 8 website) to install it:

Ubuntu ‘apt-get’ list of commands (cheat sheet)

I have a couple of Ubuntu Linux systems, including Raspberry Pi systems, test servers, and production servers. It seems like every time I have to use an apt-get or other apt command, I always have to search for the command I need. To put an end to that, I’m creating this “apt-get reference page.” It’s very terse, as I’ve just written it for myself, but I hope it’s also helpful for others.

How to drop the first matching element in a Scala sequence

Summary: This blog post shows one way to drop/filter the first matching element from a Scala sequence (Seq, List, Vector, Array, etc.). I don’t claim that the algorithm is efficient, but it does work.

Background

While creating some Scala test code earlier today I had an immutable list of toppings for a pizza, and I got into a situation where I wanted to remove the first instance of a topping.

PHP: How to remove non-printable characters from strings

PHP FAQ: How do I remove all non-printable characters from a string in PHP?

I don’t know of any built-in PHP functions to remove all non-printable characters from a string, so the solution is to use the preg_replace function with an appropriate regular expression.