Feature #9043

Add String#f method as shortcut for #freeze

Added by Charles Nutter over 3 years ago. Updated about 3 years ago.

Target version:


We have String#b to create a binary-encoded String, and we have the "f" suffix (going away, hopefully) and the "literal".freeze optimization (#8992). I think it would be reasonable to add String#f as a shorter method for producing a frozen string.

If String#f is added the "literal".freeze optimization could be dropped in favor of "literal".f. This would provide something very close to the original "literal"f syntax but in a backward-compatibility-friendly way (class String; alias f freeze; end).


#1 [ruby-core:57968] Updated by Charles Nutter over 3 years ago

  • Category set to core
  • Target version set to 2.1.0

#2 [ruby-core:57978] Updated by Charlie Somerville over 3 years ago

I feel really negatively about optimizing only String#f and not String#freeze. You could make the argument that it's backwards compatible, but in reality it means every bit of code that wants to use this optimization needs to monkey patch its own String#f.

Otherwise I support adding String#f as an alias for String#freeze and removing f-suffix syntax.

#3 [ruby-core:58296] Updated by Charles Nutter over 3 years ago

  • Assignee set to Yukihiro Matsumoto

The change to optimize String#freeze has landed for #8992, which compiler-optimizes String#freeze. The only remaining decision is whether to also add #f with the same optimization.

matz likes the idea of String#f. I'm happy either way, since #8992 landed, but a shorter method would be nice. With String#f acting like "str"f, we'd only be one character more verbose than the original syntax.

I believe matz needs to decide this one.

#4 [ruby-core:58303] Updated by Eric Wong over 3 years ago

Fwiw, I am against adding aliases to the same method,
especially extremely short names which are hard to search for.

It is confusing and increases overhead for reading/following code.

Easy-to-write code is not necessary easy-to-read.
(speaking as a sometimes Perl hacker)

#5 [ruby-core:59155] Updated by Yukihiro Matsumoto about 3 years ago

Despite the OP's intention, String#f should not be an alias to #freeze, but should work as #dedup described in #9229.
I am quite positive, but it must be too late for 2.1.


#6 [ruby-core:59378] Updated by Charles Nutter about 3 years ago

  • Target version changed from 2.1.0 to 2.2.0

I'd like to see this get into 2.2, and it sounds like Matz wants it too.

#7 [ruby-core:59392] Updated by Eric Wong about 3 years ago

I'm still against this (and having aliases at all for standard).
It makes code harder to search/read, especially when they have
short names like "f".

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