Using the value of a variable as another variables name in Ruby

Question

I\'m just starting out in learning Ruby and I\'ve written a program that generates some numbers and assigns them to variables @one, @two, @three etc. The user can then speci

Answer 1

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".

Answer 2

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' variable

varname = "myvar"
@uservars[varname] = 5   # Set a variable by name
value = @uservars[varname]  # Get a variable by name