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Ruby: String to Array

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0

1

How would you convert a string to an array in Ruby?

What I want to do is convert a string like "[value1, value2, value3]" to an array [value1, value2, value3]. Keep in mind some of these values may be strings themselves.

I am trying to write it in a method called str_to_ary.

def str_to_ary
 @to_convert = self
 #however everything I try beyond this point fails
end

ruby

share|improve this question

edited Mar 8 at 18:55

E_net4

13k73872

asked Mar 8 at 15:24

KWZXKWZX

756

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Could you use some example values instead of value1, value2, value3? As is the question looks a bit ambiguous. It can be easily interpreted that they can be local variables defined beforehand, in which case this will require some eval black magic.
  
  – ndnenkov
  Mar 8 at 15:45
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You wish to convert a string to an array containing value1, value2 and value3. Presumably those are local variables or methods (not literals). Is that what you intend?
  
  – Cary Swoveland
  Mar 8 at 21:52
  
  

  
  
  
  

add a comment | 

0

1

How would you convert a string to an array in Ruby?

What I want to do is convert a string like "[value1, value2, value3]" to an array [value1, value2, value3]. Keep in mind some of these values may be strings themselves.

I am trying to write it in a method called str_to_ary.

def str_to_ary
 @to_convert = self
 #however everything I try beyond this point fails
end

ruby

share|improve this question

edited Mar 8 at 18:55

E_net4

13k73872

asked Mar 8 at 15:24

KWZXKWZX

756

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Could you use some example values instead of value1, value2, value3? As is the question looks a bit ambiguous. It can be easily interpreted that they can be local variables defined beforehand, in which case this will require some eval black magic.
  
  – ndnenkov
  Mar 8 at 15:45
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You wish to convert a string to an array containing value1, value2 and value3. Presumably those are local variables or methods (not literals). Is that what you intend?
  
  – Cary Swoveland
  Mar 8 at 21:52
  
  

  
  
  
  

add a comment | 

How would you convert a string to an array in Ruby?

What I want to do is convert a string like "[value1, value2, value3]" to an array [value1, value2, value3]. Keep in mind some of these values may be strings themselves.

I am trying to write it in a method called str_to_ary.

def str_to_ary
 @to_convert = self
 #however everything I try beyond this point fails
end

ruby

share|improve this question

edited Mar 8 at 18:55

E_net4

13k73872

asked Mar 8 at 15:24

KWZXKWZX

756

def str_to_ary
 @to_convert = self
 #however everything I try beyond this point fails
end

share|improve this question

edited Mar 8 at 18:55

E_net4

13k73872

asked Mar 8 at 15:24

KWZXKWZX

756

share|improve this question

edited Mar 8 at 18:55

E_net4

13k73872

asked Mar 8 at 15:24

KWZXKWZX

756

edited Mar 8 at 18:55

E_net4

13k73872

edited Mar 8 at 18:55

E_net4

13k73872

asked Mar 8 at 15:24

KWZXKWZX

756

asked Mar 8 at 15:24

KWZXKWZX

756

2 Answers
2

active

oldest

votes

8

Well, that looks like a JSON.

require 'json'

def str_to_ary
 JSON.parse(@to_convert)
end

Note that this is true and works only if those string values in there are between double quotes, not single quotes.

share|improve this answer

answered Mar 8 at 15:25

UrsusUrsus

21.8k31631

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  That worked just as intended. I appreciate the help. :)
  
  – KWZX
  Mar 8 at 15:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Great, glad to hear that :)
  
  – Ursus
  Mar 8 at 15:37
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Don't forget to mark as accepted answers that solved your problem. This helps others find solutions that work.
  
  – tadman
  Mar 8 at 20:01
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The string the OP posted is not valid JSON. An array must contain an array, an object, a number, a string, or other primitive type. value1 is neither of those things, therefore the string is not valid JSON and cannot be parsed as JSON.
  
  – Jörg W Mittag
  Mar 9 at 13:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @JörgWMittag those value1 etc are numbers or strings
  
  – Ursus
  Mar 9 at 14:13
  
  

  
  
  
  

 | 
show 3 more comments

1

well if you know that [ is always on the first place and ] is always on the last place then you can start with

string = "[X, 1, Test, 22, 3]"
trimmed = string[1,string.length-2]
array = trimmed.split(", ")

array => ["X", " 1", " Test", " 22", " 3"]

if you want to then cast 1, 22 or 3 into Integers then that's a different problem that requires more thought. What values are you expecting to have in the array?

share|improve this answer

edited Mar 8 at 16:14

answered Mar 8 at 15:36

beniutekbeniutek

461519

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  split on ", " to get rid of the spaces
  
  – steenslag
  Mar 8 at 16:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes, you are correct. I've edited the answer :)
  
  – beniutek
  Mar 8 at 16:15
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Simple parsers like this inevitably end up with tons of corner cases (missing values, mangled values, crashes). Best to stick with a standard parser like json if you know the format fits
  
  – Max
  Mar 8 at 19:04
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Based on the OP's example, "[X, 1, Test, 22, 3]" is to be converted to [X, 1, Test, 22, 3], not an array of strings.
  
  – Cary Swoveland
  Mar 8 at 21:50
  

  
  
  
  

add a comment | 

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8

Well, that looks like a JSON.

require 'json'

def str_to_ary
 JSON.parse(@to_convert)
end

Note that this is true and works only if those string values in there are between double quotes, not single quotes.

share|improve this answer

answered Mar 8 at 15:25

UrsusUrsus

21.8k31631

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  That worked just as intended. I appreciate the help. :)
  
  – KWZX
  Mar 8 at 15:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Great, glad to hear that :)
  
  – Ursus
  Mar 8 at 15:37
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Don't forget to mark as accepted answers that solved your problem. This helps others find solutions that work.
  
  – tadman
  Mar 8 at 20:01
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The string the OP posted is not valid JSON. An array must contain an array, an object, a number, a string, or other primitive type. value1 is neither of those things, therefore the string is not valid JSON and cannot be parsed as JSON.
  
  – Jörg W Mittag
  Mar 9 at 13:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @JörgWMittag those value1 etc are numbers or strings
  
  – Ursus
  Mar 9 at 14:13
  
  

  
  
  
  

 | 
show 3 more comments

8

Well, that looks like a JSON.

require 'json'

def str_to_ary
 JSON.parse(@to_convert)
end

Note that this is true and works only if those string values in there are between double quotes, not single quotes.

share|improve this answer

answered Mar 8 at 15:25

UrsusUrsus

21.8k31631

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  That worked just as intended. I appreciate the help. :)
  
  – KWZX
  Mar 8 at 15:36
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Great, glad to hear that :)
  
  – Ursus
  Mar 8 at 15:37
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Don't forget to mark as accepted answers that solved your problem. This helps others find solutions that work.
  
  – tadman
  Mar 8 at 20:01
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The string the OP posted is not valid JSON. An array must contain an array, an object, a number, a string, or other primitive type. value1 is neither of those things, therefore the string is not valid JSON and cannot be parsed as JSON.
  
  – Jörg W Mittag
  Mar 9 at 13:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @JörgWMittag those value1 etc are numbers or strings
  
  – Ursus
  Mar 9 at 14:13
  
  

  
  
  
  

 | 
show 3 more comments

Well, that looks like a JSON.

require 'json'

def str_to_ary
 JSON.parse(@to_convert)
end

Note that this is true and works only if those string values in there are between double quotes, not single quotes.

share|improve this answer

answered Mar 8 at 15:25

UrsusUrsus

21.8k31631

require 'json'

def str_to_ary
 JSON.parse(@to_convert)
end

share|improve this answer

answered Mar 8 at 15:25

UrsusUrsus

21.8k31631

answered Mar 8 at 15:25

UrsusUrsus

21.8k31631

answered Mar 8 at 15:25

UrsusUrsus

21.8k31631

1

well if you know that [ is always on the first place and ] is always on the last place then you can start with

string = "[X, 1, Test, 22, 3]"
trimmed = string[1,string.length-2]
array = trimmed.split(", ")

array => ["X", " 1", " Test", " 22", " 3"]

if you want to then cast 1, 22 or 3 into Integers then that's a different problem that requires more thought. What values are you expecting to have in the array?

share|improve this answer

edited Mar 8 at 16:14

answered Mar 8 at 15:36

beniutekbeniutek

461519

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  split on ", " to get rid of the spaces
  
  – steenslag
  Mar 8 at 16:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes, you are correct. I've edited the answer :)
  
  – beniutek
  Mar 8 at 16:15
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Simple parsers like this inevitably end up with tons of corner cases (missing values, mangled values, crashes). Best to stick with a standard parser like json if you know the format fits
  
  – Max
  Mar 8 at 19:04
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Based on the OP's example, "[X, 1, Test, 22, 3]" is to be converted to [X, 1, Test, 22, 3], not an array of strings.
  
  – Cary Swoveland
  Mar 8 at 21:50
  

  
  
  
  

add a comment | 

1

well if you know that [ is always on the first place and ] is always on the last place then you can start with

string = "[X, 1, Test, 22, 3]"
trimmed = string[1,string.length-2]
array = trimmed.split(", ")

array => ["X", " 1", " Test", " 22", " 3"]

if you want to then cast 1, 22 or 3 into Integers then that's a different problem that requires more thought. What values are you expecting to have in the array?

share|improve this answer

edited Mar 8 at 16:14

answered Mar 8 at 15:36

beniutekbeniutek

461519

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  split on ", " to get rid of the spaces
  
  – steenslag
  Mar 8 at 16:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes, you are correct. I've edited the answer :)
  
  – beniutek
  Mar 8 at 16:15
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Simple parsers like this inevitably end up with tons of corner cases (missing values, mangled values, crashes). Best to stick with a standard parser like json if you know the format fits
  
  – Max
  Mar 8 at 19:04
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Based on the OP's example, "[X, 1, Test, 22, 3]" is to be converted to [X, 1, Test, 22, 3], not an array of strings.
  
  – Cary Swoveland
  Mar 8 at 21:50
  

  
  
  
  

add a comment | 

well if you know that [ is always on the first place and ] is always on the last place then you can start with

string = "[X, 1, Test, 22, 3]"
trimmed = string[1,string.length-2]
array = trimmed.split(", ")

array => ["X", " 1", " Test", " 22", " 3"]

if you want to then cast 1, 22 or 3 into Integers then that's a different problem that requires more thought. What values are you expecting to have in the array?

share|improve this answer

edited Mar 8 at 16:14

answered Mar 8 at 15:36

beniutekbeniutek

461519

string = "[X, 1, Test, 22, 3]"
trimmed = string[1,string.length-2]
array = trimmed.split(", ")

array => ["X", " 1", " Test", " 22", " 3"]

share|improve this answer

edited Mar 8 at 16:14

answered Mar 8 at 15:36

beniutekbeniutek

461519

answered Mar 8 at 15:36

beniutekbeniutek

461519

answered Mar 8 at 15:36

beniutekbeniutek

461519