# Base62 encoding in Ruby<\/span>\n# Useful for creating tiny url slugs from numeric ids<\/span>\n#<\/span>\n# Example:<\/span>\n#   Base62.encode 1_000_000   # => "4c92"<\/span>\nmodule<\/span> Base62<\/span>\n  CHARS<\/span> =<\/span> (<\/span>'0'<\/span>.<\/span>.<\/span>'9'<\/span>)<\/span>.<\/span>to_a<\/span> +<\/span> (<\/span>'a'<\/span>.<\/span>.<\/span>'z'<\/span>)<\/span>.<\/span>to_a<\/span> +<\/span> (<\/span>'A'<\/span>.<\/span>.<\/span>'Z'<\/span>)<\/span>.<\/span>to_a<\/span>\n\n  # Adapted from http://refactormycode.com/codes/125-base-62-encoding<\/span>\n  def<\/span> self<\/span>.<\/span>encode<\/span>(<\/span>i<\/span>)<\/span>\n    return<\/span> '0'<\/span> if<\/span> i<\/span> ==<\/span> 0<\/span>\n    s<\/span> =<\/span> ''<\/span>\n    while<\/span> i<\/span> ><\/span> 0<\/span>\n      s<\/span> <<<\/span> CHARS<\/span>[<\/span>i<\/span>.<\/span>modulo<\/span>(<\/span>62<\/span>)<\/span>]<\/span>\n      i<\/span> /=<\/span> 62<\/span>\n    end<\/span>\n    s<\/span>.<\/span>reverse!<\/span>\n    s<\/span>\n  end<\/span>\nend<\/span>\n<\/pre><\/div>\n