From: Brian Candler <lists@...>
Date: 2012-10-20T06:17:14+09:00
Subject: Re: Converting binary string to integer for a Ruby newbie

John Ringwalt wrote in post #1080074:
> I want to convert a string of binary code ("011001") to the integer
> value WITHOUT using to_i or any other preset method. How can I do this?
>
> Thanks for reading.

One of many solutions:

res = 0
str.each_char do |c|
  res *= 2
  res +=1 if c == "1"
end

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