Using the value of a variable as another variables name in Ruby
Use instance_variable_set (rubydoc)
instance_variable_set("@" + varname, value)In most cases though, you should separate your normal Ruby variables from the variables your user is interacting with. How about creating a Hash of user variables, e.g.
@uservars = { 'one' => 1, 'two' => 2 }two = @uservars['two'] # Look up 'two' variablevarname = "myvar"@uservars[varname] = 5 # Set a variable by namevalue = @uservars[varname] # Get a variable by name
Instance variables can be retrieved via this method:
input = instance_variable_get("@one")After this, in your case you'll have input equal to "21".