Ruby中的多行注释？

Question

如何在Ruby中注释多行？

Answer 1

#!/usr/bin/env ruby

=begin
Every body mentioned this way
to have multiline comments.

The =begin and =end must be at the beginning of the line or
it will be a syntax error.
=end

puts "Hello world!"

<<-DOC
Also, you could create a docstring.
which...
DOC

puts "Hello world!"

"..is kinda ugly and creates
a String instance, but I know one guy
with a Smalltalk background, who
does this."

puts "Hello world!"

##
# most
# people
# do
# this


__END__

But all forgot there is another option.
Only at the end of a file, of course.

Answer 2

=begin
My 
multiline
comment
here
=end

Answer 3

尽管存在=begin和=end,正常和更正确的评论方式是#在每一行使用's.如果您阅读任何ruby库的源代码,您会发现这几乎是所有情况下多线注释的完成方式.

Answer 4

#!/usr/bin/env ruby

=begin
Between =begin and =end, any number
of lines may be written. All of these
lines are ignored by the Ruby interpreter.
=end

puts "Hello world!"

Answer 5

使用:

=begin
This
is
a
comment
block
=end

要么

# This
# is
# a
# comment
# block

是rdoc目前唯一支持的两个,这是我认为只使用这些的一个很好的理由.

Answer 6

=begin
(some code here)
=end

和

# This code
# on multiple lines
# is commented out

都是正确的.第一种评论的优点是可编辑性 - 它更容易取消注释,因为删除的字符越少.第二种注释的优点是可读性 - 逐行读取代码,更容易判断特定行已被注释掉.你的电话,但想想谁跟你在一起,以及他们阅读和维护是多么容易.

Answer 7

这是一个例子:

=begin 
print "Give me a number:"
number = gets.chomp.to_f

total = number * 10
puts  "The total value is : #{total}"

=end

所有你放在间=begin和=end会的代码有多少行包含之间无论视为注释.

注意:确保=和之间没有空格begin:

• 正确: =begin
• 错误: = begin

Answer 8

=begin
comment line 1
comment line 2
=end

确保=begin并且=end是该行的第一件事（没有空格）