Problem to convert Array of a string to ruby object

Question

I tried to pass array of string to use puts in ruby print it value with math operator. But get the wrong result. I thingk it need to convert to object to achieve this as follow.

my_string_array     =  ["100*(4+1)"]
my_string = my_string_array.join(' ') # => "100*(4+1)"
my_ruby_valuation = my_string.to_i # => 100 (Wrong)

What I expected is

puts my_ruby_valuation #=> 500

Are you trying to execute the code in the string? In that case, use eval, but there are security concerns to look for. — Jaffa
– Jaffa, Commented Jun 11, 2020 at 6:47
Yes, (thank for security issue but it's internal process for this one). It's work Would you move or add your comment in answer — PKul
– PKul, Commented Jun 11, 2020 at 13:15

Paulo Tarud · Accepted Answer · 2020-06-12 02:48:39Z

1

You should use eval kernel function. https://apidock.com/ruby/Kernel/eval

 my_string_array     =  ["100*(4+1)"]
 eval(my_string_array[0])

I hope this helps.

answered Jun 12, 2020 at 2:48

Paulo Tarud

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