Merge 295fe153ad into 1513611857

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below the description to indicate that this method of accessing an indefinite number of function arguments has been superseded by the use of the spread operator via rest parameters for ES6+ compatibility.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).
 
-_1506 TILs and counting..._
+_1507 TILs and counting..._
 
 ---
 
@@ -1211,6 +1211,7 @@ _1506 TILs and counting..._
 - [Enumerate A Pairing Of Every Two Sequential Items](ruby/enumerate-a-pairing-of-every-two-sequential-items.md)
 - [Evaluating One-Off Commands](ruby/evaluating-one-off-commands.md)
 - [Exclude Values From An Array](ruby/exclude-values-from-an-array.md)
+- [Execute Several Commands With Backtick Heredoc](ruby/execute-several-commands-with-backtick-heredoc.md)
 - [Exit A Process With An Error Message](ruby/exit-a-process-with-an-error-message.md)
 - [Expect A Method To Be Called And Actually Call It](ruby/expect-a-method-to-be-called-and-actually-call-it.md)
 - [Extract A Column Of Data From A CSV File](ruby/extract-a-column-of-data-from-a-csv-file.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);

ruby/execute-several-commands-with-backtick-heredoc.md

@@ -0,0 +1,38 @@
+# Execute Several Commands With Backtick Heredoc
+
+A fun feature of Ruby is that we can execute a command in a subprocess just by
+wrapping it in backticks.
+
+For instance, we might shell out to `git` to check if a file is tracked:
+
+```ruby
+`git ls-files --error-unmatch #{file_path} 2>/dev/null`
+$?.success?
+```
+
+But what if we need to execute several commands? Perhaps they depend on one
+another. We want them to run in the same subprocess.
+
+For this, we can use the backtick version of a heredoc. That is a special
+version of a heredoc where the delimiter is wrapped in backticks.
+
+```ruby
+puts <<`SHELL`
+  # Set up trap
+  trap 'echo "Cleaning up temp files"; rm -f *.tmp' EXIT
+  
+  # Create temporary file
+  echo "test data" > work.tmp
+  
+  # Do some work
+  cat work.tmp
+  
+  # Trap will clean up on exit
+SHELL
+```
+
+Here we set up a `trap` for file cleanup on exit, then create a file, then do
+something with the file, and that's it, the process exits (triggering the
+trap).
+
+[source](https://ruby-doc.org/3.3.6/syntax/literals_rdoc.html#label-Here+Document+Literals)