How to Use instance_exec in Ruby on Rails
Ruby is known for its flexibility and powerful metaprogramming capabilities. One such method that often comes up in Ruby development, particularly in Ruby on Rails applications, is [instance_exec](https://ruby-doc.org/3.2.0/BasicObject.html#method-i-instance_exec). It allows developers to execute a block of code within the context of an object’s instance, making it extremely useful for dynamically executing code within objects without exposing unnecessary details or methods.
instance_exec is a Ruby method that belongs to the Object class, which means every Ruby object has access to it. Its primary role is to evaluate a given block in the context of an object’s instance. It takes a block and optional arguments, allowing the block to access instance variables and methods of the object it is executed within.
In the above example, we are using instance_exec to access the instance variables @a and @b from within the block passed to instance_exec. Normally, these variables would not be accessible from outside the class, but instance_exec gives us that control.
