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Emanuel Wetterqvist
4,941 PointsAre these two expressions delivering the same result?
I'm trying to get my head around some basic Ruby syntax and was wondering whether example #1 is equivalent of example #2 below. And if so what are the pros and cons of each method?
Option #1 myfile = File.open('file.txt', "w") myfile.puts('Hello everybody')
Option #2 File.open('file.txt', "w") do |myfile| puts('Hello everybody') end
2 Answers
Kenan Memis
47,314 PointsHi,
First of all, both options do not write anything to the file you want to create. When you use File.open() you have to close the file. Also Option2 syntax is not correct.
I guess you want to obtain the following solutions and yes, both are equivalent:
Option1:
myfile = File.open('file.txt', "w")
myfile.puts('Hello everybody')
myfile.close
Option2:
File.open('file.txt', "w") do |myfile|
myfile.puts('Hello everybody')
myfile.close
end
If you want to simplify Option2 you can use write method of File class without using close method. But in Option1 syntax you definetely should use close method:
File.open('file.txt', "w") do |myfile|
myfile.write('Hello everybody')
end
Emanuel Wetterqvist
4,941 PointsThanks for this! I assumed the syntax was a bit off, just trying to get my head around variables created on the fly in Ruby on a conceptual level.