Add Create And Jump Into A Directory as a Zsh 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).
 
-_1602 TILs and counting..._
+_1603 TILs and counting..._
 
 See some of the other learning resources I work on:
 - [Ruby Operator Lookup](https://www.visualmode.dev/ruby-operators)
@@ -1896,6 +1896,7 @@ If you've learned something here, support my efforts writing daily TILs by
 
 - [A Better Way To Reload ZSH Configuration](zsh/a-better-way-to-reload-zsh-configuration.md)
 - [Add To The Path Via Path Array](zsh/add-to-the-path-via-path-array.md)
+- [Create And Jump Into A Directory](zsh/create-and-jump-into-a-directory.md)
 - [Link A Scalar To An Array](zsh/link-a-scalar-to-an-array.md)
 - [Use A Space To Exclude Command From History](zsh/use-a-space-to-exclude-command-from-history.md)
 

zsh/create-and-jump-into-a-directory.md

@@ -0,0 +1,64 @@
+# Create And Jump Into A Directory
+
+[Oh My Zsh](https://github.com/ohmyzsh/ohmyzsh) defines a function `take` that
+we can use to both create and `cd` into a directory. If the directory already
+exists, it will simply `cd` into that directory.
+
+```bash
+~/code
+❯ take take-demo
+
+~/code/take-demo
+❯ mkdir already-exists
+
+~/code/take-demo
+❯ take already-exists
+
+~/code/take-demo/already-exists
+❯ cd ..
+
+~/code/take-demo
+❯ take one/two/three
+
+~/code/take-demo/one/two/three
+❯
+```
+
+First `take` creates and `cd`s into `take-demo`. Then `take` only `cd`s into
+`already-exists`. Then we see that `take` can create multiple levels of nested
+directories.
+
+With the help of `which` we can see how `take` is defined:
+
+```bash
+$ which take
+take () {
+        if [[ $1 =~ ^(https?|ftp).*\.tar\.(gz|bz2|xz)$ ]]
+        then
+                takeurl "$1"
+        elif [[ $1 =~ ^([A-Za-z0-9]\+@|https?|git|ssh|ftps?|rsync).*\.git/?$ ]]
+        then
+                takegit "$1"
+        else
+                takedir "$@"
+        fi
+}
+```
+
+We're not dealing with compressed files or git URLs, so we fall through to the
+`else` block with invokes `takedir`.
+
+```bash
+$ which takedir
+takedir () {
+        mkdir -p $@ && cd ${@:$#}
+}
+```
+
+The `mkdir -p $@` is what allows it make new, nested directories and then we
+`cd` to it. The `${@:$#}` is a way of [grabbing the last argument to the
+function](https://stackoverflow.com/a/37601842/535590). This suggests that you
+can pass multiple things to `take`, it will create all of them, and then `cd`
+you into the last one.
+
+[source](https://github.com/ohmyzsh/ohmyzsh/blob/master/lib/functions.zsh#L75-L85)