Merge 295fe153ad into 02086e7115

Hello, I've added a small blockquote below the description to indicate that this method of accessing an indefinite number of function arguments has been superseded by the use of the spread operator via rest parameters for ES6+ compatibility.

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).
 
-_1453 TILs and counting..._
+_1455 TILs and counting..._
 
 ---
 
@@ -80,6 +80,7 @@ _1453 TILs and counting..._
 * [XState](#xstate)
 * [YAML](#yaml)
 * [Zod](#zod)
+* [Zsh](#zsh)
 
 ---
 
@@ -1726,6 +1727,11 @@ _1453 TILs and counting..._
 - [Incorporate Existing Type Into Zod Schema](zod/incorporate-existing-type-into-zod-schema.md)
 - [Set Custom Error Message For Nonempty Array](zod/set-custom-error-message-for-nonempty-array.md)
 
+### Zsh
+
+- [Add To The Path Via Path Array](zsh/add-to-the-path-via-path-array.md)
+- [Link A Scalar To An Array](zsh/link-a-scalar-to-an-array.md)
+
 ## Usage
 
 The `.vimrc` file for this project contains a function `CountTILs` that can

javascript/accessing-arguments-to-a-function.md

@@ -5,6 +5,8 @@ an array-like object with all of the arguments to the function. Even if not
 all of the arguments are referenced in the function signature, they can
 still be accessed via the `arguments` object.
 
+> For ES6+ compatibility, the `spread` operator used via [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters) is preferred over the `arugments` object when accessing an abritrary number of function arguments.
+
 ```javascript
 function argTest(one) {
   console.log(one);

zsh/add-to-the-path-via-path-array.md

@@ -0,0 +1,25 @@
+# Add To Path Via Path Array
+
+Typically when managing what is on your path in a Unix shell environment, you
+override the `PATH` environment variable with `export`. This is usually an
+append or prepend to bring along the existing path entries.
+
+```bash
+$ export PATH="$PATH:/Users/me/.local/bin"
+```
+
+The `zsh` shell environment exposes another way of adding to your path. They
+have a `path` array which can be a little easier to work with since you can use
+an array operation instead of string interpolation.
+
+Here is how we'd do the same as above:
+
+```bash
+$ path+=/Users/me/.local/bin
+```
+
+This works because there is an automatic linking in zsh between arrays and
+colon-separated strings (_scalars_).
+[source](https://www.zsh.org/mla/users//2005/msg01132.html)
+
+[source](https://superuser.com/a/1447959)

zsh/link-a-scalar-to-an-array.md

@@ -0,0 +1,38 @@
+# Link A Scalar To An Array
+
+`Zsh` has a builtin command `typeset` that does a variety of things. When given
+the `-T` flag and the names of a scalar and an array, it will link them
+together so that a change to one is reflected in the other.
+
+The scalar is a string of values delimited by a colon (`:`). The array is an
+array that can be interacted with using array operations like append (`+=`).
+
+```bash
+$ typeset -T FOO foo
+
+$ echo $FOO
+
+
+$ export FOO="one:two"
+
+$ echo $foo
+one two
+
+$ foo+=three
+
+$ echo $FOO
+one:two:three
+```
+
+Notice `FOO` is initially empty. I then `export` it to overwrite it with two
+values delimited by a colon. Since `foo` is automatically kept in sync, I can
+`echo $foo` and see those values displayed as an array. I can then append a
+third value using an array operation on `foo`. The update will be automatically
+reflected in `FOO`.
+
+`Zsh` does this under the hood for `PATH` and `path` which is why you can [add
+to the path via the path array](add-to-the-path-via-path-array.md).
+
+See `man zshbuiltins` for more details.
+
+[source](http://devlib.symbian.slions.net/s3/GUID-D87C96CE-3F23-552D-927C-B6A1D61691BF.html)