Feature #8765: Literal for symbol with interpolation

• Status: Feedback
• Assignee: -
• Target version: -

[sawa (Tsuyoshi Sawada)]

=begin
I propose a symbol literal %S with interpolation

foo = 3
%s{#{foo}} # => :"\#{foo}"
%S{#{foo}} # => :"3"

The conventional :"" literal looks as if it is a unary operator to a string. Since there are both %q and %Q literals for string, I don't see any reason why symbols only have %s.
=end

[duerst (Martin Dürst)]

• Status changed from Open to Feedback

Do you need this in an actual program? There is %q and %Q because there is '' and "", and that's because interpolation in Strings is very frequent. Interpolation for Symbols is very rare, as far as I know.

[sawa (Tsuyoshi Sawada)]

=begin
There are :" " and :' ' notations, whose existence indicate that symbol literals with and without interpolation are used. A typical use case for symbol literal is to create symbols from a list of words with a common prefix. For example, you may have a list of words

%w[foo bar baz]

and may want to create out of it a list of symbols with a common prefix:

%i[my_foo my_bar my_baz]

which, by the proposed syntax, can be created as:

%w[foo bar baz].map{|w| %S"my_#{w}"}

=end

[tenderlovemaking (Aaron Patterson)]

On Sat, Aug 10, 2013 at 10:59:24PM +0900, sawa (Tsuyoshi Sawada) wrote:

Issue #8765 has been reported by sawa (Tsuyoshi Sawada).

---

Feature #8765: Literal for symbol with interpolation
https://bugs.ruby-lang.org/issues/8765

Author: sawa (Tsuyoshi Sawada)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:

=begin
I propose a symbol literal %S with interpolation

foo = 3
%s{#{foo}} # => :"\#{foo}"
%S{#{foo}} # => :"3"

The conventional :"" literal looks as if it is a unary operator to a string. Since there are both %q and %Q literals for string, I don't see any reason why symbols only have %s.

irb(main):001:0> RUBY_VERSION
=> "2.0.0"
irb(main):002:0> foo = 3
=> 3
irb(main):003:0> %i{#{foo}}
=> [:"#{foo}"]
irb(main):004:0> %I{#{foo}}
=> [:"3"]
irb(main):005:0>

--
Aaron Patterson
http://tenderlovemaking.com/

[sawa (Tsuyoshi Sawada)]

tenderlovemaking

What is your intention?

-1 here