how to solve this equation in ruby

Question

path1="c:/kabab.txt"
path2="c:/kabab2.txt"
for v in 1..2
puts "#{path}"#{v}"
end

I would like to create a file, but I'm not able to do that.

Answer 1

In Ruby you can't retrieve the value of a local variable from its name using the approach you've tried. There is instance_variable_get for instance variables but there isn't an equivalent for local variables as far as I know.

"path#{v}" is a string containing the name of your variable so if you evaluate that using eval the result from the eval will be the value of the variable. Therefore you could do something like:

filename = eval("path#{v}")
open(filename, 'w')

but you always need to be careful when using eval because of potential security issues.

Instead, I would put the list of files in an array

paths = ["c:/kabab.txt", "c:/kabab2.txt"]

and do:

paths.each do |path|
  f = open(path, 'w')
  # use file here
end

or if all the files share a common prefix and extension then something like:

prefix = "c:/kabab"
extension = ".txt"
for v in 1..2
  filename = "#{prefix}#{v}#{extension}"
  # use filename here
end