Ruby trying to dynamically create unicode string throws "invalid Unicode escape" error

Question

I have a requirement wherein I want to dynamically create a unicode string using interpolation.For e.g. please see the following code tried out in irb ``` 2.1.2 :016 > hex = 0x0905 => 2309 2.1.2 :017 > b = "\u#{hex}" SyntaxError: (irb):17: invalid Unicode escape b = "\u#{hex}" ``` The hex-code 0x0905 corresponds to unicode for independent vowel for DEVANAGARI LETTER A. I am unable to figure how to achieve the desired result.

Accepted Answer

You can pass an encoding to `Integer#chr`: ``` hex = 0x0905 hex.chr('UTF-8') #=> "अ" ``` The parameter can be omitted, if `Encoding::default_internal` is set to UTF-8: ``` $ ruby -E UTF-8:UTF-8 -e "p 0x0905.chr" "अ" ``` You can also append codepoints to other strings: ``` '' << hex #=> "अ" ```

Ruby trying to dynamically create unicode string throws "invalid Unicode escape" error

Solution

Problem