What are blocks in Ruby and how do they work?

What are blocks in Ruby and how do they work?

Blocks in Ruby are chunks of code that can accept input and be passed to methods. They are defined using either braces {} or the do...end syntax.

Can you give me an example of a block in Ruby?

Sure! Here's a simple example:

[1, 2, 3].each do |number|
  puts number * 2
end

This block doubles each number in the array.

What is the difference between a block and a method?

A block is an anonymous piece of code that can be passed to methods, while a method is a defined function that can be called by name.

Are there any performance considerations when using blocks?

Yes, using blocks can sometimes lead to performance overhead, especially if they create closures. It's best to use them judiciously.