How to substitute integers with letters in Ruby - regex

Question

I am new to Ruby and programming. I am working on a card game. I have a variable (straightHigh) currently filled with a number n representing a rank of a card. I want certain numbers (11-14) to be replaced with specific letters (11 => J, 12 => Q, 13 => K, 14 => A).
I've tried gsub and gsub! with and without regular expressions. But regular expressions are very foreign to me.
if y == 5
straightHigh = n + 4
#straightHigh.to_s.gsub!(/[11-14]/, 11 => 'J', 12 => 'Q', 13 => 'k', 14 => 'A')
p straightHigh.to_s
end
I've tried:
straightHigh.to_s.gsub!(/[11-14]/, 14 => 'Ace', 13 => K, 12 => Q, 11 => J)
which resulted in syntax errors.
I've tried
straightHigh.to_s.gsub!(/[11-14]/, 'Ace')
this does not throw an error, but does not seem to alter the values either.

Answer 1

Maybe you should use a case statement:
def get_card(number)
case number
when 2..10
return number.to_s
when 11
return 'J'
when 12
return 'Q'
when 13
return 'J'
when 14
return 'Ace'
end
end

Answer 2

I am not sure what you are trying to do, but I believe you are trying to map an integer with a string? If so, you can use a hash:
# straight_high Integer
# returns String
def get_card(straight_high)
card_values = {
11 => 'J',
12 => 'Q',
13 => 'K',
14 => 'Ace',
}
card_values[straight_high]
end