Use variable in parameter ruby on rails? [closed]

Answer 1

You are looking for this:

if params.key?(filenamestring[-1])

This will check if the key exists within the params.

Edit: Something like this would add the param to an array:

my_array << params[filenamestring[-1]] if params.key?(filenamestring[-1])

Or to add it to a string or integer:

my_variable + params[filenamestring[-1]] if params.key?(filenamestring[-1])

If you are doing something else, let me know and I'll update my answer again.