Posts by user
Scala, 78 67 64 bytes Saved 3 bytes thanks to Razetime Stream.iterate(_)(x=>math.pow(x,x%2+.5).toInt).takeWhile(_>1):+1 Try it in Scastie! Stream.iterate(_) //Make an infinite list by r...
APL (Dyalog Unicode), 33 bytes {×x←⊃(2⌷⍵)(÷⍨(/⍨)0=|)⍺×1⌷⍵:x∇⍵⋄⍺} Try it online! The first case doesn't work because it gets really big, but the other two do. The input is taken on the left a...
Haskell, 51 31 bytes Saved 20 bytes thanks to Hakerh400! data S=S[S] f i=S$map f[0..i-1] Try it online! S is a recursive data structure, because sets of varying element types can't be repr...
APL (ngn/apl), 6 bytes {∇¨⍳⍵} Try it online! Dyalog APL and dzaima/APL appear to not give empty vectors for ⍳0, so I used ngn/APL. I don't know how to turn on boxing there, though, so there'...
Scala, 83 bytes x=>x.init#::Stream.iterate(x)(x=>x++(x,x.tail).zipped.map(_-_))indexWhere(_.last<1) Try it online! Takes input as a list of two numbers. The fact that the length can...
APL (Dyalog Unicode), 30 29 bytes Saved 1 byte thanks to Razetime (could've saved 1 more with a tradfn, but I didn't feel like it) {∧/(0=1|+/÷≢)¨1↓¨g¨(g←∪⊢∨⍳)⍵} Try it online! This answer w...
Scala 3, 68 bytes _.zipWithIndex.flatMap(_.zipWithIndex.filter(_._1)map(_._2)map _.->) Try it in Scastie! Takes a List[List[Boolean]], returns a List[(Int, Int)]. This abuses underscores a ...
APL(Dyalog Unicode), 34 29 bytes SBCS Saved 5 bytes thanks to Razetime! {2>s←⌈2÷⍨≢⍵:⍵⋄,⍉↑∇¨s(↑,⍥⊂↓)⍵} Try it on APLgolf! {2>s←⌈2÷⍨≢⍵:⍵⋄,⍉↑∇¨s(↑,⍥⊂↓)⍵} { } ...
Scala 3, 80 bytes @main def m={val s="@main def m={val s=%c%s%1$c;printf(s,34,s)}";printf(s,34,s)} Try it in Scastie! The printf replaces %c and %1$c in string s with the quote character (34 i...
Scala 3, 50 44 bytes ? => ?.indices zip?map(?take _+1 count _.==) Try it in Scastie! This is an annoying, stupid approach. The more elegant one using inits was much longer (x=>x.inits.to...
APL (Dyalog Unicode), 11 7 bytes (SBCS) Razetime and rak1507 came up with 7 byte equivalents of my original dfn (this one's rak1507's). See their solutions below. +/¨⊢=,\ Try it online! +/¨...
Scala (-language:postfixOps), 4 solutions 1. Just 256: 256 2. Casting a character: +'Ā' The character Ā is 256 in decimal, and the unary + turns it into an Int. 3. Hashcode of a string: ...
APL (Dyalog Unicode), 32 bytes (SBCS) {⊃(⊢(/⍨)⍵=+/¨),∘.,⍨(⊢~∘.×)⍨1↓⍳⍵} Try it online! {⊃(⊢(/⍨)⍵=+/¨),∘.,⍨(⊢~∘.×)⍨1↓⍳⍵} ⍳⍵ ⍝ Range from 1 to n ...
Making a function with val can be shorter than with a def If you're pattern matching, you can use Scala's special syntax and omit match when assigning an anonymous function to a val. As you can se...
What general tips do you have for golfing in Scala? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to Scala (e.g. "remove comments" i...
Scala, 99 bytes s=>{val x=s+s.reverse s(0)+"\n"+x.tail.init.zipWithIndex.map{case(c,i)=>c+" "*i+c+"\n"}.mkString+x} Try it in Scastie!
Scala, 9 bytes _.reverse Try it in Scastie! Explanation: _.reverse _ //The function argument . //Call a method reverse //Reverse the string
Scala, 55 bytes (Stream from 1 map 1.0./scanLeft.0)(_+_)indexWhere _.<= Try it online! Written in a more sane manner: n => Stream.from(1).map(1.0/_).scanLeft(0.0)(_+_).indexWhere(_ &g...
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