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Anonymous function A code golf answer can be an anonymous function[1]. That is, a function that can be defined without giving it a name (in programming languages that allow this). If an anonymous...
A snippet is not a valid answer A code golf answer must in general be able to take input[1] and give output. A snippet of code that is not contained in a function or program cannot take input[2], ...
Given a positive integer, count its odd digits. Input An integer from 1 to 999,999,999, inclusive, in any of the following formats: A number (such as an integer or floating point number), li...
Python, 37 27 bytes First, with input as an integer: lambda i:sum(ord(x)&1for x in str(i)) This converts the number to string (in the base-10 default) and processes each character. It expl...
Japt -mx, 2 1 byte u Try it u :Implicit map of input array u :Modulo 2 :Implicit output of sum of resulting array
JavaScript, 25 bytes Input as an array of digits a=>a.map(x=>t+=x%2,t=0)|t Try it online! 26 bytes With input as a string (or an array of digit strings). f=([d,...a])=>d?d%2+f(a):0...
Japt v1.4.5, 4 bytes ¶â¬× Try it ¶â¬× :Implicit input of integer ¶ :Is equal to ⬠:Proper divisors × :Reduced by multiplication
Haskell, 110 bytes c[]=1>0 c(a:b:_)|abs(a-b)==1=1<0 c(_:b)=c b f=0:1:zipWith(+)f(tail f) h=[g|g<-f,c.map fromEnum.show$g] r=(h!!) Try it online!
65,535 The database field can already handle up to 65,535 (216 - 1) characters. Same for all post types and categories I don't see a need for different limits for questions and answers, or for d...
Vyxal, 4 bytes Expects a string. O2%∑ Try it here! Explanation O2%∑ O ord 2% modulo 2 ∑ sum
HTML, 31 Bytes <HTML style="background:black"> The best solution is frequently the easiest one.
Jelly, 45 bytes L‘ḃ5MḢ;‘$œṖƲḅ5aị¥⁸N1¦Sṭ “¢¦½2d‘Çȷ6¡iḃ5ị“IVXLC Try it online! A pair of links that takes an integer as its argument and returns a string with the shortest generalised Roman num...
Charcoal, 88 bytes ≔⪪η λＦＬθ«¿¬⁼θ⁰«≔…θ⁺ι¹π¿№λπ«≔πω§≔λ⌕λω⁰»«¿Σ⭆λ⁼…κ⁺ι¹π«≔§Φλ⁼…κ⁺ι¹π⁰ω§≔λ⌕λω⁰»«θ≔⁰θ»»»»¿¬⁼θ⁰«ω Try it online!
Find the shortest representation of an integer in generalised Roman numerals. Since there is more than one way to generalise, only the following definition applies to this challenge. Definition T...
Haskell, 62 bytes (\n->(scanl(*)1$cycle[5,2])!!(length$takeWhile(/=n)"IVXLCDM")) No import needed. It just uses standard Prelude functions. scanl(*)1$cycle[5,2] will give you the infinit...
Swift, 114 bytes func y(x:String)->Int?{return ["I":1,"V":5,"X":10,"L":50,"C":100,"D":500,"M":1000].filter{$0.key==x}.first?.value} Try it online! Explanation + Non-Golfed Version The no...
Python 3, 149 bytes g=lambda r:r>1and g(r-1)+g(r-2)or r lambda n:[i for(i)in map(g,range(2*n+2))if(lambda*l:all(abs(n-i)!=1for(n,i)in zip(l,l[1:])))(*map(int,str(i)))][n] Try it online! ...
C, 59 byte h(n){return n&4?n&2?5:n&1?1e3:n&8?50:500:n&2?100:n&1?1:10;} Old version, 60 byte: h(n){return n&4?n&2?5:n&1?1000:n&8?50:500:n&2?100:n&...
ESCR - not a golfing answer This isn't really an answer to the question, and it's not an attempt at golfing. However, it shows a cute trick for solving this problem that falls out of the way the ...
Pyth, 8 bytes qu/Red._ Try it online! A list is in a loop if and only if it is the first list seen twice as f is applied repeatedly. qu/Red._ u Apply the following function, ...
Pyth, 15 bytes !f.A-VtTsM._T.p Try it online! Outputs True if no valid recipe exists, False if one does. If truthy/falsy outputs are allowed, the ! can be removed, to just output all valid per...
HTML, 28 Bytes <HTML style=background:#000> #000 is shorter than black and quote marks are officially required but browsers figure it out.
Pyth, 25 23 bytes @f-1aM.:jT;2u+Gs>2GyQU2 Try it online! First, we generate the Fibonacci numbers: u+Gs>2GyQU2 U2 range(2), the list [0, 1] u Apply the follow...
HTML, 25 bytes <style>*{background:#000} Not really sure if this is a legal solution, but technically you can open it in your browser...
JavaScript (V8), 185 bytes for(c=99;c;)print((f=(s=` on the wall`)=>`${c||99} bottle${~-c?`s`:``} of beer`+s)()+`, ${f``}. ${--c?`Take one down and pass it around`:`Go to the store and buy s...
