Add Install Latest Version Of Ruby With asdf as a Ruby TIL

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1552 TILs and counting..._
+_1553 TILs and counting..._
 
 ---
 
@@ -1269,6 +1269,7 @@ _1552 TILs and counting..._
 - [Iterate With An Offset Index](ruby/iterate-with-an-offset-index.md)
 - [Include Extra Context In A Honeybadger Notify](ruby/include-extra-context-in-a-honeybadger-notify.md)
 - [Ins And Outs Of Pry](ruby/ins-and-outs-of-pry.md)
+- [Install Latest Version Of Ruby With asdf](ruby/install-latest-version-of-ruby-with-asdf.md)
 - [Invoking Rake Tasks Multiple Times](ruby/invoking-rake-tasks-multiple-times.md)
 - [IRB Has Built-In Benchmarking With Ruby 3](ruby/irb-has-built-in-benchmarking-with-ruby-3.md)
 - [Jump Out Of A Nested Context With Throw/Catch](ruby/jump-out-of-a-nested-context-with-throw-catch.md)

ruby/install-latest-version-of-ruby-with-asdf.md

@@ -0,0 +1,54 @@
+# Install Latest Version Of Ruby With asdf
+
+When I check the `asdf` Ruby plugin for known versions of Ruby:
+
+```bash
+$ asdf list-all ruby | fzf
+```
+
+I don't find the latest (`3.4`).
+
+I need to update the plugin. A newer version of the plugin will know about
+newer Ruby versions.
+
+```bash
+$ asdf plugin-update ruby
+```
+
+Now, if I run the `list-all` command again, I'll find the version I'm looking
+for — `3.4.1`.
+
+Now that `asdf` and I both know about the version to be installed, I can tell
+`asdf` to install it:
+
+```bash
+$ asdf install ruby 3.4.1
+```
+
+Now, if I check the current Ruby version, I'll see that it is still set to some
+other version.
+
+```bash
+$ ruby --version
+ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-darwin22]
+```
+
+I need to tell `asdf` to start using this newly installed version instead,
+either globally or locally.
+
+```bash
+$ # globally
+$ asdf global ruby 3.4.1
+$ # or locally
+$ asdf local ruby 3.4.1
+```
+
+And now I'm all set:
+
+```bash
+$ asdf current ruby
+ruby            3.4.1           /Users/jbranchaud/.tool-versions
+
+$ ruby --version
+ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [x86_64-darwin22]
+```