Merge 295fe153ad into 8574113dc6

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below the description to indicate that this method of accessing an indefinite number of function arguments has been superseded by the use of the spread operator via rest parameters for ES6+ compatibility.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).
 
-_1504 TILs and counting..._
+_1505 TILs and counting..._
 
 ---
 
@@ -887,6 +887,7 @@ _1504 TILs and counting..._
 
 - [Access Instance Variables](python/access-instance-variables.md)
 - [Create A Dummy DataFrame In Pandas](python/create-a-dummy-dataframe-in-pandas.md)
+- [Dunder Methods](python/dunder-methods.md)
 - [Store And Access Immutable Data In A Tuple](python/store-and-access-immutable-data-in-a-tuple.md)
 - [Test A Function With Pytest](python/test-a-function-with-pytest.md)
 - [Use pipx To Install End User Apps](python/use-pipx-to-install-end-user-apps.md)

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);

python/dunder-methods.md

@@ -0,0 +1,22 @@
+# Dunder Methods
+
+Python has all kinds of special, or rather, _magic_ methods that allow for
+customizing all kinds of class behavior. There is `__init__()`, `__bool__()`,
+and so many others.
+
+The thing they all have in common is that their names are wrapped in _double
+underscores_. This is why they are called _dunder methods_.
+
+Some of these are used every single day, like the `__init__()` method for
+defining how a class should create an object. Others, used from time to time,
+are for overriding how comparisons or conversions happen. E.g. you may want to
+override `__bool__()` or `__len__()` to customize the truthiness of a custom
+class.
+
+There are so many others, ones you probably haven't even heard of. To see a
+full listing, check out this [cheat sheet of every dunder
+method](https://www.pythonmorsels.com/every-dunder-method/#cheat-sheet).
+
+Note: these are not to be confused with _dunder attributes_ which are things
+like `__name__`, `__file__`, and `__version__` which correspond to a value that
+you can access in a specific context rather than behavior to override.