Add Create A CSV::Table Object as a ruby til

Author: jbranchaud

README.md

@@ -9,7 +9,7 @@ and pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://tinyletter.com/jbranchaud).
 
-_906 TILs and counting..._
+_907 TILs and counting..._
 
 ---
 
@@ -691,6 +691,7 @@ _906 TILs and counting..._
 - [Comparing Arrays In RSpec](ruby/comparing-arrays-in-rspec.md)
 - [Construct A Constant From A String](ruby/construct-a-constant-from-a-string.md)
 - [Create an Array of Stringed Numbers](ruby/create-an-array-of-stringed-numbers.md)
+- [Create a CSV::Table Object](ruby/create-a-csv-table-object.md)
 - [Create A Hash From An Array Of Arrays](ruby/create-a-hash-from-an-array-of-arrays.md)
 - [Create Listing Of All Middleman Pages](ruby/create-listing-of-all-middleman-pages.md)
 - [Create Named Structs With Struct.new](ruby/create-named-structs-with-struct-new.md)

ruby/create-a-csv-table-object.md

@@ -0,0 +1,37 @@
+# Create A CSV::Table Object
+
+When you parse a file or string using `CSV.parse` (with `headers = true`) you
+get a [`CSV::Table`]() object in response. This object can be used to read what
+was in a file or it can be used to create a new file. It is also handy as a
+potential test object if you want to assume, but omit, file reading in a unit
+test.
+
+You can create a `CSV::Table` one of the following two ways. First, with a file:
+
+```ruby
+require 'csv'
+
+file = # read in file
+csv_table = CSV.parse(file, headers: true)
+```
+
+Second, with a string, or even better, a HEREDOC:
+
+```ruby
+require 'csv'
+
+csv_table =
+  CSV.parse(<<-CSV, headers: true)
+    first_name,last_name,taco
+    Josh,Branchaud,"Al Pastor"
+    Jake,Worth,Cauliflower
+  CSV
+
+csv_table.headers
+#=> ["first_name", "last_name", "taco"]
+```
+
+From here, you can do what you need with it, whether that is using it in a test
+or writing it to a file.
+
+[source](https://ruby-doc.org/stdlib-2.6.3/libdoc/csv/rdoc/CSV.html#class-CSV-label-CSV+with+headers)