Add Method Missing notebook

Author: cdalvaro

README.md

@@ -27,6 +27,7 @@ But if you prefer using Jupyter, you can follow the [official documentation](htt
   13. [Read/Write Text Files](notebooks/ReadWriteTextFiles.ipynb)
   14. [Regular Expressions](notebooks/RegularExpressions.ipynb)
   15. [Classes](notebooks/Classes.ipynb)
+  16. [Method Missing](notebooks/MethodMissing.ipynb)
 
 ## Acknowledgments
 

notebooks/MethodMissing.ipynb

@@ -0,0 +1,65 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "third-craps",
+   "metadata": {},
+   "source": [
+    "# Ruby Method Missing\n",
+    "\n",
+    "When you send a message to an object, the object executes the first method it finds on its [method lookup path](http://phrogz.net/RubyLibs/RubyMethodLookupFlow.pdf) with the same name as the message. If it fails to find any such method, it raises a `NoMethodError` exception - unless you have provided the object with a method called `method_missing`.\n",
+    "\n",
+    "The `method_missing` method is passed the symbol of the non-existent method, an array of the arguments that were passed in the original call and any block passed to the original method.\n",
+    "\n",
+    "`method_missing` is in part a safety net: It gives you a way to interpret unanswerable messages and handle them gracefully."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "injured-lewis",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "There's no method called anything here -- please try again.\n"
+     ]
+    }
+   ],
+   "source": [
+    "class Dummy\n",
+    "  def method_missing(m, *args, &block)\n",
+    "    puts \"There's no method called #{m} here -- please try again.\"\n",
+    "  end\n",
+    "end\n",
+    "\n",
+    "Dummy.new.anything"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "bulgarian-speaker",
+   "metadata": {},
+   "source": [
+    "_You are also responsible for maintaining the `method_missing` signature._ It's possible to write a hook that captures only a missing method's name while ignoring its arguments and associated block."
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Ruby 3.0.0",
+   "language": "ruby",
+   "name": "ruby"
+  },
+  "language_info": {
+   "file_extension": ".rb",
+   "mimetype": "application/x-ruby",
+   "name": "ruby",
+   "version": "3.0.1"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}