Ruby - 意外返回（LocalJumpError）

Question

Ruby 2.0

为什么下面的代码会给出意外的返回（LocalJumpError）？

# some code here
puts "Scanning for xml files .."
zip_files = Dir.entries(directory).select { |f| File.extname(f) == '.zip' }
if(zip_files.count == 0)
    puts "No files found, exiting..."
    return
end
# more code here ( if files found)

Error: unexpected return (LocalJumpError)

No files found, exiting...
[Finished in 0.9s with exit code 1]

Answer 1

你不在某种方法中。你不能从那里return。如果您想提前退出，请使用exit。

Answer 2

或者，您可以营救LocalJumpError

puts "Scanning for xml files .."
zip_files = Dir.entries(directory).select { |f| File.extname(f) == '.zip' }

begin
  return unless zip_files.count > 0

  # more code here ( if files found)
rescue LocalJumpError
  puts "No files found, exiting..."
end