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In ruby 1.9.3, I can get the codepoints of a string: > "foo\u00f6".codepoints.to_a => [102, 111, 111, 246] Is there a built-in method to go the other direction, ie from integer array to string? I'm aware of: # not acceptable; only works with UTF-8 [102, 111, 111, 246].pack("U*") # works, but not very elegant [102, 111, 111, 246].inject('') {|s, cp| s << cp } # concise, but I need to unshift that pesky empty string to "prime" the inject call ['', 102, 111, 111, 246].inject(:<<) UPDATE (response to Niklas' answer) Interesting discussion. pack("U*") always returns a UTF-8 string, while the inject version returns a string in the file's source encoding. #!/usr/bin/env ruby # encoding: iso-8859-1 p [102, 111, 111, 246].inject('', :<<).encoding p [102, 111, 111, 246].pack("U*").encoding # this raises an Encoding::CompatibilityError [102, 111, 111, 246].pack("U*") =~ /\xf6/ For me, the inject call returns an ISO-8859-1 string, while pack returns a UTF-8. To prevent the error, I could use pack("U*").encode(__ENCODING__) but that makes me do extra work. UPDATE 2 Apparently the String#<< doesn't always append correctly depending on the string's encoding. So it looks like pack is still the best option. [225].inject(''.encode('utf-16be'), :<<) # fails miserably [225].pack("U*").encode('utf-16be') # works

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