Add Precedence Of Logical Operators as a Ruby TIL

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)