Add Precedence Of Logical Operators as a Ruby TIL

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
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@@ -1058,6 +1058,7 @@ _1259 TILs and counting..._
 - [Passing Arguments To A Rake Task](ruby/passing-arguments-to-a-rake-task.md)
 - [Pattern Match Values From A Hash](ruby/pattern-match-values-from-a-hash.md)
 - [Percent Notation](ruby/percent-notation.md)
+- [Precedence Of Logical Operators](ruby/precedence-of-logical-operators.md)
 - [Question Mark Operator](ruby/question-mark-operator.md)
 - [Rake Only Lists Tasks With Descriptions](ruby/rake-only-lists-tasks-with-descriptions.md)
 - [Read The First Line From A File](ruby/read-the-first-line-from-a-file.md)

ruby/precedence-of-logical-operators.md

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+# Precedence Of Logical Operators
+
+There are two sets of logical operators that you are going to see in Ruby. The
+more common and idiomatic set are `!`, `&&`, and `||`. Relative to all the
+other operators in the Ruby language, these three have high precedence.
+
+The other set of logical operators are `not`, `and`, and `or`. These ones have
+relatively much lower precedence. Though they work conceptually the same.
+
+The reason to be aware of the differences in precedence is that if you were to
+mix the two sets, you could end up with unexpected results.
+
+```ruby
+> not true && false
+=> true
+> !true && false
+=> false
+```
+
+To keep my Ruby code idiomatic and to avoid these kinds of potential logical
+mixups, I stick to using nearly exclusively the first set—`!`, `&&`, and `||`.
+
+[source](https://ruby-doc.org/core-2.6.2/doc/syntax/precedence_rdoc.html)