Self-Types in Scala - the Why and the How | Rock the JVM

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  • Опубликовано: 23 ноя 2024

Комментарии • 35

  • @jmhimara
    @jmhimara 2 года назад +2

    This is a great example of one of the fundamental weaknesses of the OOP paradigm, and something that is bound to get exponentially worse as the domain logic gets larger and more complex. IMO, neither option really solves the problem in a satisfactory method -- admittedly, self-types are an elegant approach, albeit still just a Band-Aid to the larger problem.

  • @jeanfdmelo
    @jeanfdmelo 4 года назад +8

    Keep videos coming, Daniel! That's gold!

    • @rockthejvm
      @rockthejvm  4 года назад

      Thanks! Share with whoever you think might find it useful!

  • @megadethjohn
    @megadethjohn 4 года назад +5

    Great video! One of the more concise and informative explanations of self types out there.

  • @pbawa2003
    @pbawa2003 3 года назад +1

    Really well explained about self types and difference from inheritance using trait extensions

  • @XINClover
    @XINClover 3 года назад +1

    Very clearly explained. I learn new things every day. Thank you Daniel!

  • @nilanjansarkar100
    @nilanjansarkar100 2 года назад

    Daniel, you rock man! This explains things so clearly!

  • @mompyish
    @mompyish 3 года назад +1

    This is awesome!!.. I have been struggling to find out the meaning of this syntax in one of libraries..Blogs and article did't help.Thanks Daniel

  • @sergeibatiuk3468
    @sergeibatiuk3468 Год назад

    Nice! But can you use this pattern (the Cake pattern?) to compose classes or is it for traits only?

  • @harishgontu9285
    @harishgontu9285 4 года назад +1

    Nice !! You should join Leo Benkel scala server. It is a place where they try to encourage budding scala devs

  • @ddosia1313
    @ddosia1313 Год назад +1

    Amazing video, thx!

  • @Jankoekepannekoek
    @Jankoekepannekoek 4 года назад +1

    I use this mechanism often to access a reference to an outer class when I'm creating inner classes, since in Scala you can't say 'MyOuterClass.this' like you can in Java.

  • @rheafernandeshallu
    @rheafernandeshallu 4 года назад +1

    Thank you again :) It's really helping me get better at writing code.

  • @tai-hao-le
    @tai-hao-le 3 года назад +1

    great video but I am still a bit confused about the difference between self-types and inheritance. do you have any additional resources to research this subject? thanks!

    • @rockthejvm
      @rockthejvm  3 года назад

      How are you confused? Maybe I can help here.

  • @egorkovesh5033
    @egorkovesh5033 3 года назад +1

    13:11 people constantly ask me "WHAT THE F...undamental diffrence..."

  • @avinashc6114
    @avinashc6114 3 года назад +1

    It's clear thank you 🔥

  • @romanburenko7593
    @romanburenko7593 3 года назад

    Great explanation! Thanks a lot!

  • @StefanReich
    @StefanReich 3 года назад +3

    Couldn't you simply put a field of type Person into the Diet trait?

    • @rockthejvm
      @rockthejvm  3 года назад +1

      As always, there are multiple solutions to the same problem.

    • @sergeibatiuk3468
      @sergeibatiuk3468 Год назад

      @@rockthejvm But what are the pros and cons of both?

  • @elgireth
    @elgireth 4 года назад

    Key difference is that self type can be generic, which is used in F-Bounded polymorphism.

    • @rockthejvm
      @rockthejvm  4 года назад +1

      F-bounded polymorphism is something else. It can be used in conjunction with self-types, but that's not the defining difference between self-types and inheritance.

  • @moy2010
    @moy2010 3 года назад

    What about an associated type? It seems to me that it achieves exactly the same as the self type, dunno why they needed to add yet another way to express the same.

    • @rockthejvm
      @rockthejvm  3 года назад

      What do you mean by associated type?

    • @moy2010
      @moy2010 3 года назад

      @@rockthejvm I found that they are called "Abstract types" in Scala, and seems that this discussion has already been done in StackOverflow: stackoverflow.com/questions/1154571/scala-abstract-types-vs-generics

    • @rockthejvm
      @rockthejvm  3 года назад +1

      @@moy2010 you mean abstract type members. These are different than self-types and they serve a different purpose.

  • @DevInsideYou
    @DevInsideYou 4 года назад

    Why not just add person to eat?
    def eat(thing: Edible, person: Person): Boolean

    • @rockthejvm
      @rockthejvm  4 года назад +2

      This would be very similar to the extension option #1, because we bleed API dependencies from one type to the other.