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I have an array:
array = ["10", "20", "50", "99"] And I want to convert it into a simple comma-separated string list like this:
"10", "20", "50", "99" 
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How to get a comma separated string from an array in C#? We can get a comma-separated string from an array using String. Join() method. In the same way, we can get a comma-separated string from the integer array.
Use the String. split() method to convert a comma separated string to an array, e.g. const arr = str. split(',') . The split() method will split the string on each occurrence of a comma and will return an array containing the results.
Use the join() Function to Convert a List to a Comma-Separated String in Python. The join() function combines the elements of an iterable and returns a string. We need to specify the character that will be used as the separator for the elements in the string.
The simplest way to convert an array to comma separated String is to create a StringBuilder, iterate through the array, and add each element of the array into StringBuilder after appending the comma.
array.join(',') will almost do what you want; it will not retain the quotes around the values nor the spaces after.
For retaining quotes and spaces: array.map{|item| %Q{"#{item}"}}.join(', ') This will print "\"10\", \"20\", \"50\", \"99\"". The escaped quotes are necessary assuming the question does in fact call for a single string.
Documentation on the %Q: string literals.
You could use inspect as suggested in another answer, I'd say that's personal preference. I wouldn't, go look at the source code for that and choose for yourself.
Useful aside: array.to_sentence will give you a "1, 2, 3 and 4" style output, which can be nice!
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