From: "byroot (Jean Boussier)" <noreply@...>
Date: 2022-02-21T22:01:15+00:00
Subject: [ruby-core:107701] [Ruby master Feature#18595] Alias `String#-@` as `String#dedup`

Issue #18595 has been updated by byroot (Jean Boussier).


> Because the first 2 constants actually create 2 objects instead of the single equivalent interned object.

Well, that's why I suggested not to use literals, because in your example the first two constants will point to the same object because `.freeze` has specific support in the parser (it's equivalent to enabling `frozen_string_literal`)

So yes `"string_literal".freeze` does intern, but `"foo".upcase.freeze` doesn't.

> should use .freeze when: (a) we want it to run faster, and (b) we don't care about possible extra memory usage.

Pretty much yes. I'd add: (c) when we know the string is most likely unique.







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Feature #18595: Alias `String#-@` as `String#dedup`
https://bugs.ruby-lang.org/issues/18595#change-96618

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
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This is a rescoped feature request for https://bugs.ruby-lang.org/issues/16295

### Rationale

[Unary operator have some precedence oddities](https://bugs.ruby-lang.org/issues/16150#note-39) (@headius)

This often force to use parentheses, which is awkward and breaks the chaining flow.

It's really not obvious what it does. I submitted many pull requests to various open source projects to reduce their memory footprint, and I am constantly asked what it does and I have to point to the `String#-@` documentation. [The last example was 3 days ago](https://github.com/dry-rb/dry-schema/pull/399#issuecomment-1043963073).

I believe that `String#dedup` would help users discover this feature, and in projects where 3.2 is the oldest supported version, it would allow for much clearer code.

### Proposal

It's all in the title: Alias `String#-@` as `String#dedup`.

Or maybe even rename `String#-@` as `String#dedup`, and make `String#-@` the alias?



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