Ruby output contents of an array as a comma separated string Ruby
RubyArraysRuby on-Rails-3Ruby Problem Overview
Is there a more correct way to output the contents of an array as a comma delimited string
@emails = ["[email protected]", "[email protected]", "[email protected]"]
@emails * ","
=> "[email protected]", "[email protected]", "[email protected]"
This works but I am sure there must be a more elegant solution.
Ruby Solutions
Solution 1 - Ruby
Have you tried this:
@emails.join(",")
Solution 2 - Ruby
Though the OP and many answers imply that the array always has content, sometimes I find myself needing to join a list that may contain "empty" elements (typically for concatenating data for a UI).
Here is little "progression" of how different approaches handle such an "imperfect" array of strings:
['a','b','',nil].join(',') # => "a,b,,"
['a','b','',nil].compact.join(',') # => "a,b,"
['a','b','',nil].compact.reject(&:empty?).join(',') # => "a,b"
['a','b','',nil].reject(&:blank?).join(',') # Rails only
The last one being my favorite (Rails) approach.
Solution 3 - Ruby
I just had to do something similar in an ERB template using AllowedUsers <%= _allowed_users.join(" ") %>. It might not be as elegant as you were looking for, but it's the same implementation I've seen in several languages, so that might be a win for readability.