If I use a `var` or `val` in an interface, do I al...

# announcements

[Robert]

If I use a var or val in an interface, do I always have to use override to "implement" it? I tried using abstract in the interface, but that's no help

[Sam Schilling]

What is your goal? To avoid the override keyword? You need that to indicate you are defining/initializing a value that comes from the interface

[Robert]

Basically, yes. I chose this over a constructor with named parameters, but the override is making it more complex that I'd like to

[Robert]

Same thing for abstract class

[Robert]

abstract class testA {
    abstract val test: Int
}

class testB: testA() {
    override val test: Int = 1
}

[Robert]

I have like 20+ properties which should all have a value

[Sam Schilling]

you can implement the property in the interface using accessors, but in that case the implementation would be the same across multiple inheritors. Otherwise you’ve got to use override.

[Robert]

Hmm, maybe I'd better switch to named constructor parameters then, or use data classes

[Sam Schilling]

Why the hesitancy for using override?

[Sam Schilling]

It’s not as if it makes the code more complex, it just makes it more explicit that the properties come from an interface

[Robert]

Yeah, just visual. I know have 20 lines with override var. Just would look cleaner without it, that's basically it.

[Sam Schilling]

Regardless you are going to have 20 lines with var, the override just helps distinguish from other variables that aren’t from the interface. I don’t think it makes it look less clean, it makes it more explicit. I think the unclean aspect is moreso the fact that you have 20 vars to begin with, but that may be unavoidable depending on your use case.

[Robert]

Yeah well, it looks kinda shit tbh 😉

override val consensus by lazy {
        object: Params {
            override var nSubsidyHalvingInterval = 210000
            override var BIP16Exception = SHA256("0x00000000000002dc756eebf4f49723ed8d30cc28a5f108eb94b1ba88ac4f9c22");
            override var BIP34Height = 227931u
            override var BIP34Hash = SHA256("0x000000000000024b89b42a942fe0d9fea3bb44ab7bd1b19115dd6a759c0808b8");
            override var BIP65Height = 388381u
            override var BIP66Height = 363725u
            override var CSVHeight = 419328u
            override var SegwitHeight = 481824u
            override var nMinerConfirmationWindow = 2016u // nPowTargetTimespan / nPowTargetSpacing
            override var MinBIP9WarningHeight = this.SegwitHeight + this.nMinerConfirmationWindow;
            override var powLimit = SHA256("00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
            override var nPowTargetTimespan = 14u * 24u * 60u * 60u
            override var nPowTargetSpacing = 10u * 60u
            override var fPowAllowMinDifficultyBlocks = false
            override var fPowNoRetargeting = false
            override var nRuleChangeActivationThreshold = 1916 // 95% of 2016
            override val vDeployments = mapOf(
                DeploymentPos.DEPLOYMENT_TESTDUMMY to BIP9Deployment(
                    28u,
                    1199145601u, // January 1, 2008
                    1230767999u // December 31, 2008
                )
            )
            override var nMinimumChainWork = SHA256("0x000000000000000000000000000000000000000008ea3cf107ae0dec57f03fe8")
            override var defaultAssumeValid = SHA256("0x00000000000000000005f8920febd3925f8272a6a71237563d78c2edfdd09ddf") // 597379
        }
    }

[Robert]

Guess named parameters are cleaner

[Robert]

I'll just go with that

[Sam Schilling]

I don’t think removing the overrides makes it look much better tho lol

[Sam Schilling]

But yeah, named parameters are one way to go about it

[Sam Schilling]

And in this case would probably help it look more clean

[Robert]

Yeah, the naming will change once I refactor it, that'll make it a little more shitty

[Sam Schilling]

Also, if you want to make things look a little cleaner I’d recommend following the style guide for properties
https://kotlinlang.org/docs/reference/coding-conventions.html#property-names

[Robert]

Yes, I am just migrating it 1:1 for now, and will refactor it to okayish names once the code is complete 👍

[Robert]

Ty