How do I eval multiple lines of code in ruby?

eval('puts "f开发者_开发技巧f"\nputs "ff"')

I tried to use two expressions in one eval but it doesn't execute?

How do I do this? I want to know because I want to dynamically execute partial code.

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With heredoc syntax. File and line number are passed to give reference information in back traces.

eval(<<-CODE, __FILE__, __LINE__ +1 )
  some(:ruby);
  code
  # and comments
CODE

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eval("puts 'ff'\nputs 'ff'")

also works. '\n' gets treated as literally a slash and an n, because single quotes work differently to double quotes.

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I use this:

eval %{
  puts 'ff'
  puts 'hello'
}

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Do:

eval('puts "ff";puts "ff"')