Does Ruby have variable variables like PHP does?

Question

ruby

In php there is a concept like variable variables

$a=5;
$b='a';
echo $$b => 5

does something similar exist in ruby?

Answer 1

no. it is possible to operate on variables through the functions instance_variable_get/instance_variable_set
However, as in the case of PHP, this is bad practice. Use hash maps.

Answer 2

You can do something like this (in my opinion, in any language in general)

a = 1
b = a
puts a #=> 1
puts b #=> 1

Answer 3

In ruby, almost any meta-information can be accessed from the program. The local variable can be accessed through the methods of the Binding class

a = 1
b = :a
puts binding.local_variable_get(b)