I have a string looks like an array "[12,34,35,231]" But this is just a string contains square brackets at the begin and the end of it.
I need to separate strings looks like arrays and others.
To do this I want to convert a string to an array '12','34','35','231' and after conversion use it with the condition like this:
if array.is_a? Array
...
else
...
end
Could enybody tell me how to do that conversion in the right way?
It is not conversion, it is parsing.
The input string looks like JSON. If it is JSON then use the JSON Ruby module to decode it:
require 'json'
arr = JSON.parse("[12,34,35,231]")
arr is an array of numbers:
p arr
# [12, 34, 35, 231]
If you need the values as strings you can use method to_s to convert them to strings:
arr = arr.map(&:to_s)
p arr
# ["12", "34", "35", "231"]
You can use json to convert it to an array.
class T
require 'json'
def array_detect(array_string)
begin
json = JSON.parse array_string
if json.is_a? Array
# is an array
else
# not an array
end
rescue JSON::ParserError => e
puts e.message
# not a valid json string
end
end
end
str = "[12,34,35,231]"
str.split(/\D+/).reject(&:empty?)
=> ["12", "34", "35", "231"]
# If you want the elements as numbers instead of strings, do:
str.split(/\D+/).reject(&:empty?).map(&:to_i)
=> [12, 34, 35, 231]
"[12,34,35,231]"[1...-1].split(',')
each(&:to_s) makes no difference.
string[1..-2].split(',')