[arrays] 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?

This question is related to arrays ruby string split

The answer is


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.

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

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


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.


"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 ;-(..


Examples related to arrays

PHP array value passes to next row Use NSInteger as array index How do I show a message in the foreach loop? Objects are not valid as a React child. If you meant to render a collection of children, use an array instead Iterating over arrays in Python 3 Best way to "push" into C# array Sort Array of object by object field in Angular 6 Checking for duplicate strings in JavaScript array what does numpy ndarray shape do? How to round a numpy array?

Examples related to ruby

Uninitialized Constant MessagesController Embed ruby within URL : Middleman Blog Titlecase all entries into a form_for text field Ruby - ignore "exit" in code Empty brackets '[]' appearing when using .where find_spec_for_exe': can't find gem bundler (>= 0.a) (Gem::GemNotFoundException) How to update Ruby Version 2.0.0 to the latest version in Mac OSX Yosemite? How to fix "Your Ruby version is 2.3.0, but your Gemfile specified 2.2.5" while server starting Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432? How to update Ruby with Homebrew?

Examples related to string

How to split a string in two and store it in a field String method cannot be found in a main class method Kotlin - How to correctly concatenate a String Replacing a character from a certain index Remove quotes from String in Python Detect whether a Python string is a number or a letter How does String substring work in Swift How does String.Index work in Swift swift 3.0 Data to String? How to parse JSON string in Typescript

Examples related to split

Parameter "stratify" from method "train_test_split" (scikit Learn) Pandas split DataFrame by column value How to split large text file in windows? Attribute Error: 'list' object has no attribute 'split' Split function in oracle to comma separated values with automatic sequence How would I get everything before a : in a string Python Split String by delimiter position using oracle SQL JavaScript split String with white space Split a String into an array in Swift? Split pandas dataframe in two if it has more than 10 rows