Simpler array bounds checking

[ZevEisenberg]

Steps

• Add your name or username and a link to your GitHub profile into the Contributors.md file.
• Build the project on your machine. If it does not compile, fix the errors.
• Describe the purpose and approach of your pull request below.
• Submit the pull request. Thank you very much for your contribution!

Purpose

This is a slightly simpler and possibly more idiomatic way to check array bounds using the array's built-in indices collection.

Approach

See above.

[ZevEisenberg]

I wasn't able to build on my machine, possibly because I'm on a Mac?

[david-swift]

Thank you! Could you maybe share some information about your problem on macOS, maybe in the discussions? I tried this library on macOS the last time some months ago, and the build succeeded, so it probably isn't a general problem of the library itself, but one of the system/configuration.

[ZevEisenberg]

Apologies for the delay! Here's a screenshot of the errors I see, and some detail on the first one in the build log. I'm assuming I need some dependency installed, but the readme didn't mention anything that I could see. I installed libadwaita via homebrew, but it didn't help.

[david-swift]

This is probably the same problem as reported in #32. Unfortunately, we haven't yet been able to fix it (but it should work with swift run instead of Xcode's run button). Maybe you could try the steps in #11 (comment), I don't know whether this helps (in general, I'd recommend installing Linux on the device or in a VM to work with Libadwaita).