Ruby Core Language Features

Comprehensive guide to Ruby 3.x core language features, idioms, and best practices.

Blocks, Procs, and Lambdas

Blocks

Blocks are anonymous functions passed to methods:

# Block with do...end (multi-line)
[1, 2, 3].each do |n|
  puts n * 2
end

# Block with braces (single-line, returns value)
doubled = [1, 2, 3].map { |n| n * 2 }