this post was submitted on 14 Jul 2024
486 points (96.9% liked)

linuxmemes

21599 readers
671 users here now

Hint: :q!

Sister communities:

Community rules (click to expand)

1. Follow the site-wide rules

2. Be civil
  • Understand the difference between a joke and an insult.
  • Do not harrass or attack members of the community for any reason.
  • Leave remarks of "peasantry" to the PCMR community. If you dislike an OS/service/application, attack the thing you dislike, not the individuals who use it. Some people may not have a choice.
  • Bigotry will not be tolerated.
  • These rules are somewhat loosened when the subject is a public figure. Still, do not attack their person or incite harrassment.
    • 3. Post Linux-related content
  • Including Unix and BSD.
  • Non-Linux content is acceptable as long as it makes a reference to Linux. For example, the poorly made mockery of sudo in Windows.
  • No porn. Even if you watch it on a Linux machine.
    • 4. No recent reposts
  • Everybody uses Arch btw, can't quit Vim, and wants to interject for a moment. You can stop now.
    •  

    Please report posts and comments that break these rules!

    Important: never execute code or follow advice that you don't understand or can't verify, especially here. The word of the day is credibility. This is a meme community -- even the most helpful comments might just be shitposts that can damage your system. Be aware, be smart, don't fork-bomb your computer.

    founded 2 years ago
    MODERATORS
    [email protected]
    [email protected]
    [email protected]
    486
    I like C programs for their speed (lemmy.world)
    submitted 5 months ago by [email protected] to c/[email protected]
    79 comments fedilink hide all child comments
     
    you are viewing a single comment's thread
    view the rest of the comments
    [–] [email protected] 7 points 5 months ago (1 children)

    Yep. I used to code a lot in JVM languages, then started learning Rust. My initial reaction was "Why the hell does Rust have two string types?".
    Then I learned that it's for representing actual memory vs. view and what that meant. Since then I'm thinking "Why the hell do JVM languages not have two string types?".

    [–] [email protected] 2 points 5 months ago (1 children)

    I'm not a java programmer, but I think the equivalent to str would be char[]. However the ergonomics of rust for str isn't there for char[], so java devs probably use String everywhere.

    [–] [email protected] 1 points 5 months ago

    Nope, crucial difference between Java's char[] and Rust's &str is that the latter is always a pointer to an existing section of memory. When you create a char[], it allocates a new section of memory (and then you get a pointer to that).

    One thing that they might be able to do, is to optimize it in the JVM, akin to Rust's Cow.
    Basically, you could share the same section of memory between multiple String instances and only if someone writes to their instance of that String, then you copy it into new memory and do the modification there.
    Java doesn't have mutability semantics, which Rust uses for this, but I guess, with object encapsulation, they could manually implement it whenever a potentially modifying method is called...?