I have a ruby array like ['12','34','35','231'].
I want to convert it to a string like '12','34','35','231'.
How can I do that?
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13 Answers
I'll join the fun with:
['12','34','35','231'].join(', ')
# => 12, 34, 35, 231
EDIT:
"'#{['12','34','35','231'].join("', '")}'"
# => '12','34','35','231'
Some string interpolation to add the first and last single quote :P
5 Comments
Bernard
That results in "12,34,35,231". It's missing the single quotes in the result.
corroded
Okay added some string interpolation to add the first and last single quotes :P
zx1986
how to revert this?
corroded
what do you mean revert @zx1986
zx1986
@corroded Sorry, I got it.
JSON.parse("[12, 39, 100]") will return an array.> a = ['12','34','35','231']
> a.map { |i| "'" + i.to_s + "'" }.join(",")
=> "'12','34','35','231'"
2 Comments
Mladen Jablanović
Perhaps using
"'#{i}'" instead.
djburdick
don't think map is needed. join should do the trick. see below
try this code ['12','34','35','231']*","
will give you result "12,34,35,231"
I hope this is the result you, let me know
1 Comment
Laf
I think the OP needs to have the single quote as well.
array.map{ |i| %Q('#{i}') }.join(',')
2 Comments
Andrew Grimm
To quote Mladen, "Perhaps [use]
"'#{i}'" instead."
Claudio Floreani
This is the right way to do it, should be the accepted answer.
string_arr.map(&:inspect).join(',') # or other separator
4 Comments
Sean Cameron
This does not produce the correct output - the values needs to be wrapped in single quotes. If this was the desired output then string_arr.join(",") would be the better option.
avihil
Sean, you're wrong. Did you run the expression, at least once ??
Andrew Hodgkinson
It's still wrong. It results in double quotes around the array entries, not single quotes. Plus it relies upon an assumption about the format that "inspect()" prints data, which makes it fragile.
avihil
['1','2','3'].map { |o| "\'#{o}\'" }.join(',')
I find this way readable and rubyish:
add_quotes =- > x{"'#{x}'"}
p ['12','34','35','231'].map(&add_quotes).join(',') => "'12','34','35','231'"
Comments
> puts "'"+['12','34','35','231']*"','"+"'"
'12','34','35','231'
> puts ['12','34','35','231'].inspect[1...-1].gsub('"',"'")
'12', '34', '35', '231'
Comments
And yet another variation
a = ['12','34','35','231']
a.to_s.gsub(/\"/, '\'').gsub(/[\[\]]/, '')
Comments
irb(main)> varA
=> {0=>["12", "34", "35", "231"]}
irb(main)> varA = Hash[*ex.collect{|a,b| [a,b.join(",")]}.flatten]
...
Comments
irb(main):027:0> puts ['12','34','35','231'].inspect.to_s[1..-2].gsub('"', "'")
'12', '34', '35', '231'
=> nil
Comments
You can use some functional programming approach, transforming data:
['12','34','35','231'].map{|i| "'#{i}'"}.join(",")
Comments
suppose your array :
arr=["1","2","3","4"]
Method to convert array to string:
Array_name.join(",")
Example:
arr.join(",")
Result:
"'1','2','3','4'"
Comments
array.inspect.inspect.gsub(/\[|\]/, "") could do the trick
