Programming Ruby 3.3

Aliasing

alias new_name  old_name

This creates a new name that refers to an existing method, operator, global variable, or regular expression backreference ($&, $“, $’, and $+). Local variables, instance variables, class variables, and constants may not be aliased. The parameters to alias may be names or symbols.

object_ref/alias_1.rb

class Integer
  alias plus +
end
1.plus(3)        # => 4

alias $prematch $`
"string" =~ /i/  # => 3
$prematch        # => "str"

alias :cmd :`
cmd "date"       # => "Thu Nov  2 17:16:30 CDT 2023\n"

When a method is aliased, the new name refers to a copy of the original method’s body. If the original method is subsequently redefined, the aliased name will still invoke the original implementation. ...