Ruby interpolate variable in unicode string

Question

To get a unicode emoticon I do:

irb> "\u{1f384}"
=> "🎄"

but if I use a variable in the unicode I get the following error:

irb> d=4
=> 4
irb> "\u{1f38#{d}}"
(irb):11: unterminated Unicode escape
"\u{1f38#{d}}"

How to use string interpolation in unicode?

Casper · Accepted Answer · 2019-12-09 06:37:59Z

5

You can use pack('U') to generate Unicode data:

d = 4
["1f38#{d}".hex].pack("U")

answered Dec 9, 2019 at 6:37

Casper

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Comments

Stefan · Accepted Answer · 2019-12-09 07:51:56Z

4

To get a single character from a codepoint, there's chr:

d = 4
(0x1f380 + d).chr('UTF-8')
#=> "🎄"

answered Dec 9, 2019 at 7:51

Stefan

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