Ensure Clause

ensure runs cleanup-style code after a protected operation succeeds or fails.

ensure_clause.rb

mode = 
status = "starting"

begin
  status = "working"
  raise "temporary failure" if mode == "fail"
  status = "finished"
  puts "status=#{status}"
rescue RuntimeError
  status = "rescued"
  puts "status=#{status}"
ensure
  puts "ensure=ran"
end

puts "mode=#{mode}"

mode = 
status = "starting"

begin
  status = "working"
  raise "temporary failure" if mode == "fail"
  status = "finished"
  puts "status=#{status}"
rescue RuntimeError
  status = "rescued"
  puts "status=#{status}"
ensure
  puts "ensure=ran"
end

puts "mode=#{mode}"

mode = 
status = "starting"

begin
  status = "working"
  raise "temporary failure" if mode == "fail"
  status = "finished"
  puts "status=#{status}"
rescue RuntimeError
  status = "rescued"
  puts "status=#{status}"
ensure
  puts "ensure=ran"
end

puts "mode=#{mode}"

ensure An `ensure` clause runs after the `begin` body and any matching `rescue`.