How do I convert a String: s = '23534' to an array as such: a = [2,3,5,3,4]
Is there a way to iterate over the chars in ruby and convert each of them to_i or even have the string be represented as a char array as in Java, and then convert all chars to_i
As you can see, I do not have a delimiter as such , in the String, all other answers I found on SO included a delimiting char.
A simple one liner would be:
s.each_char.map(&:to_i)
#=> [2, 3, 5, 3, 4]
If you want it to be error explicit if the string is not contained of just integers, you could do:
s.each_char.map { |c| Integer(c) }
This would raise an ArgumentError: invalid value for Integer(): if your string contained something else than integers. Otherwise for .to_i you would see zeros for characters.
Short and simple:
"23534".split('').map(&:to_i)
Explanation:
"23534".split('') # Returns an array with each character as a single element.
"23534".split('').map(&:to_i) # shortcut notation instead of writing down a full block, this is equivalent to the next line
"23534".split('').map{|item| item.to_i }
You can use String#each_char:
array = []
s.each_char {|c| array << c.to_i }
array
#=> [2, 3, 5, 3, 4]
Or just s.each_char.map(&:to_i)
There are multiple way, we can achieve it this.
'12345'.chars.map(&:to_i)
'12345'.split("").map(&:to_i)
'12345'.each_char.map(&:to_i)
'12345'.scan(/\w/).map(&:to_i)
I like 3rd one the most. More expressive and simple.
'23534'.to_i.digits.reverseIn Ruby 1.9.3 you can do the following to convert a String of Numbers to an Array of Numbers:
Without a space after the comma of split(',') you get this: "1,2,3".split(',') # => ["1","2","3"]
With a space after the comma of split(', ') you get this: "1,2,3".split(', ') # => ["1,2,3"]
Without a space after the comma of split(',') you get this: "1,2,3".split(',').map(&:to_i) # => [1,2,3]
With a space after the comma of split(', ') you get this: "1,2,3".split(', ').map(&:to_i) # => [1]
