eval('puts "ff"\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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4 Answers
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
1 Comment
Steven Garcia
This should be the accepted answer - it works better for large multiline statements and facilitates debugging. Nice one!
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.
2 Comments
Zabba
Really? Would appreciate if you could point to some documentation? I thought that interchanging quotes didn't really matter ?
Andrew Grimm
@Zabba: You can try it in irb, or you can look at documentation mentioned at Backslashes in Single quoted strings vs. Double quoted strings in Ruby?
I use this:
eval %{
puts 'ff'
puts 'hello'
}
Comments
Do:
eval('puts "ff";puts "ff"')
