A collection of 100+ Scala String examples

Table of Contents1 - String equality2 - Multiline strings3 - String interpolation/substitution4 - Substrings5 - Treating a String as an Array[Char]6 - Using map and for7 - Regular expressions8 - Transforming arrays to a String9 - A lot of String method examples

This page contains a collection of over 100 Scala String examples, including strings functions, format specifiers, and more. I don’t provide too many details about how things work in these examples; this is mostly just a collection of examples that can be used as a reference page or cheat sheet. (I do show the output of most examples.)

First, here are some basic uses of the Scala String class to help get us warmed up:

Source code for an Android AsyncTask (REST client) example

I just got back into using an Android AsyncTask, and it took me a little while to re-load the concepts in my head. I used AsyncTask’s a few years ago, but haven’t used them since.

To help remember how they work, I created a little AsyncTask example project, and I’ve included all of the source code for that project here. I’ll show all of the source code for my classes and configuration files, and then explain the code at the end.

An Akka actors remote example

While doing some crazy things with SARAH, I realized that the best way to solve a particular problem was to use remote Akka actors. I haven’t had the opportunity to work with Akka much since finishing the Scala Cookbook, so I dug around trying to find a simple Akka remote “Hello, world” example. Unable to find a good one, I read some stuff, and created it myself.

“Alexa written with Akka” = Aleka

Table of Contents1 - Background2 - Assumptions3 - 1) Create an SBT project4 - 2) Create a Scala app5 - 3) Messages6 - 4) The brain7 - 5) The mouth8 - 6) The project directory structure9 - 7) Running the application10 - The source code11 - What’s next

As a way of demonstrating how to write code with Akka, Scala, and functional programming (FP), I started creating a new project this weekend. I named it Aleka, because it may eventually be like Amazon’s Echo/Alexa, written with Akka (and Scala).

(I suppose a better name might be “Ekko,” after Echo, but I have a niece named Aleka, so unless she objects, this works for me.)

A Perl script to delete binary files

As a quick note and a little bit of source code sharing, I wrote the following Perl script to delete all of the binary files it finds in a list of files it’s given. I named this script deleteBinaryFiles.pl, and it should be called like this:

deleteBinaryFiles.pl listOfFilesToLookAt

where listOfFilesToLookAt is a file that contains a list of filenames, with one filename per line.

Given that brief introduction, here’s the source code:

How to store static Help text in an Android XML file

As a note to self, when you’re writing an Android application and you think you want to store some static text in an external file, a better approach can be to create a resource file under res/values.

For example, I’m currently adding some help text to an Android app, and to do that I created a file named strings_help.xml under the res/values directory. That file contains HTML wrapped in an XML CDATA tag, like this: