What is variable scope in Ruby and how does it affect performance?

What is variable scope in Ruby?

In Ruby, variable scope refers to the context in which a variable is accessible. It determines where a variable can be used within the code.

Can you explain the different types of variable scopes in Ruby?

Sure! Ruby has several types of variable scopes: local, instance, class, and global. Local variables are accessible only within the block they are defined. Instance variables are accessible within instances of a class, class variables are shared among class instances, and global variables can be accessed from anywhere in the program.

How does variable scope affect performance in Ruby?

Variable scope can impact performance because Ruby needs to look up variable values based on their scope. Local variables are faster to access than instance or global variables due to their limited scope.

Are there best practices for using variable scope in Ruby?

Yes, it's best to limit the use of global variables and prefer local or instance variables to enhance performance and maintainability.