How to split a delimited string in Ruby and convert it to an array?

I have a string

"1,2,3,4"

and I'd like to convert it into an array:

[1,2,3,4]

How?

>> "1,2,3,4".split(",")
=> ["1", "2", "3", "4"]

Or for integers:

>> "1,2,3,4".split(",").map { |s| s.to_i }
=> [1, 2, 3, 4]

Or for later versions of ruby (>= 1.9 - as pointed out by Alex):

>> "1,2,3,4".split(",").map(&:to_i)
=> [1, 2, 3, 4]

"1,2,3,4".split(",") as strings

"1,2,3,4".split(",").map { |s| s.to_i } as integers

For String Integer without space as String

arr = "12345"

arr.split('')

output: ["1","2","3","4","5"]

For String Integer with space as String

arr = "1 2 3 4 5"

arr.split(' ')

output: ["1","2","3","4","5"]

For String Integer without space as Integer

arr = "12345"

arr.split('').map(&:to_i)

output: [1,2,3,4,5]

For String

arr = "abc"

arr.split('')

output: ["a","b","c"]

Explanation:

1. arr -> string which you're going to perform any action.
2. split() -> is an method, which split the input and store it as array.
3. '' or ' ' or ',' -> is an value, which is needed to be removed from given string.

"12345".each_char.map(&:to_i)

each_char does basically the same as split(''): It splits a string into an array of its characters.

hmmm, I just realize now that in the original question the string contains commas, so my answer is not really helpful ;-(..

the simplest way to convert a string that has a delimiter like a comma is just to use the split method

"1,2,3,4".split(',') # "1", "2", "3", "4"]

you can find more info on how to use the split method in the ruby docs

> Divides str into substrings based on a delimiter, returning an array > of these substrings. > > If pattern is a String, then its contents are used as the delimiter > when splitting str. If pattern is a single space, str is split on > whitespace, with leading whitespace and runs of contiguous whitespace > characters ignored. > > If pattern is a Regexp, str is divided where the pattern matches. > Whenever the pattern matches a zero-length string, str is split into > individual characters. If pattern contains groups, the respective > matches will be returned in the array as well. > > If pattern is omitted, the value of $; is used. If $; is nil (which is > the default), str is split on whitespace as if ` ‘ were specified. > > If the limit parameter is omitted, trailing null fields are > suppressed. If limit is a positive number, at most that number of > fields will be returned (if limit is 1, the entire string is returned > as the only entry in an array). If negative, there is no limit to the > number of fields returned, and trailing null fields are not > suppressed.