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Stephan Schroeder
04/15/2021, 8:39 AMThe Kotlin1.5 Release Candidate is out: https://blog.jetbrains.com/kotlin/2021/04/kotlin-1-5-0-rc-released/
K 21
With UInt being stable now, I wonder if they can be used for indexing in Arrays in the future. Well, all kinds of indexing actually including for Strings, like having an
fun String.indexOfOrNull(s: String): UInt?substringm
Michael Böiers
04/15/2021, 8:49 AMI was surprised that new features like the
upperCaseWhile the current methods (e.g.
toUpperCase👍 2
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Stephan Schroeder
04/15/2021, 9:18 AMare you sure that that's not simply your IDE using an older version of the language? In my case IntelliJ is flagging a lot of things, that actually running the code with gradle (and therefore the proper version of Kotlin) has no issues with.
With UInt being stable now, I wonder if they can be used for indexing in Arrays in the future. Well, all kinds of indexing actually including for Strings, like having an
fun String.indexOfOrNull(s: String): UInt?substringI'm aware that I can simply add those myself as extension functions, at least for String though doing so for Array isn't optimal because
Copy code
operator fun <T> Array<T>.get(index: UInt): T {
val indexAsInt = index.toInt()
require(indexAsInt>=0) {"index isn't allowed to be bigger than Int.MAX_VALUE ($Int.MAX_VALUE}), but is: $index"}
return this[indexAsInt]
}c
Colton Idle
04/15/2021, 9:33 AMI've never felt the need to use an Int that can't be negative (UInt?) Can someone point out a scenario where that would be needed?
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Michael Böiers
04/15/2021, 9:45 AM@Colton Idle adventofcode.com 🙂
🤔 1
In my professional work I’ve never come across a problem that required unsigned numbers. The only thing I can think of is indeed some assignments in last year’s advent of code challenge. I guess that is largely due to the fact that I never did much scientific/mathematical work.
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todd.ginsberg
04/15/2021, 1:07 PMI am so happy to see Char.digitToInt(). Now I don’t have to implement it myself for Advent of Code 2021. 😁
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Michael Böiers
04/15/2021, 1:39 PMI did last year’s AoC with TypeScript … will definitely do it with Kotlin this year. 🙂
👍 1
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rocketraman
04/15/2021, 4:47 PMThe possibility to store a bigger number in the same number of bytes without overflow i.e.
Int.MAX_VALUEUInt.MAX_VALUEe
elizarov
04/15/2021, 5:21 PMUse-cases for UInt mostly revolve around native lib interop, various byte-oriented protocols/formats, and (extremely rarely) for custom optimized data structures. They have little use elsewhere, definitely not worth using in the general application code.
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Michael Böiers
04/15/2021, 8:46 PMHere’s the challenge from AoC that involved unsigned integers. Not so easy to solve using signed ints (like plain JS numbers) … https://adventofcode.com/2020/day/14
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elizarov
04/16/2021, 5:50 AMNot really. No need https://github.com/elizarov/AdventOfCode2020/blob/main/Day14.kt
Especially when doing various programming contests I never ever needed unsigned ints of any kind.
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Michael Böiers
04/16/2021, 6:34 AMHere’s my solution, which isn’t clean and was arrived at between changing my daughter’s diapers and moving from Germany to Sweden in december. 🙂 https://github.com/MikeEnRegalia/AdventOfCode2020/blob/master/Day14.ts
I haven’t done all the AoCs - now that I “speak” Kotlin, I might do one of the previous years. Should be fun!
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elizarov
04/16/2021, 6:39 AMIf you are into this kind of programming, I do recommend to take a look at codeforces.com Their Div.3 contests are of the same complexity as AoC, but happen regularly, and there is a room to grow into higher ranks.
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Michael Böiers
04/16/2021, 6:48 AMThanks for the suggestion! There’s also codewars.com 🙂
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todd.ginsberg
04/17/2021, 4:07 PMOh cool, I had no idea you had done Advent of Code 2020 Roman! 🙂 Now I've got something to read and learn from this weekend. I solved 2020 d14 without UInt as well, FWIW.
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ianbrandt
04/20/2021, 5:15 PMWe work with network protocols that utilize unsigned types heavily, so I very much appreciate the unsigned type support in Kotlin.
I could also see unsigned types being neat for things like delay(timeMillis) and withTimeout(timeMillis), which I'm just now realizing lack documentation on how negative values are handled.
`lateinit` support for unsigned types would be nice, as would bitwise operator precedence.
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elizarov
04/26/2021, 12:18 PMUnsigned types are not designed for "negative value excluded" cases and we don't plan to use them in functions like
delay💯 2
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