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TypeScript's Type System, 211 193 bytes //@ts-ignore type F<A,C=[]>=A extends[[...infer G,infer X],[...infer H,infer Y]]?[...X,...Y,...C]extends[1,1,1,1,1,1,1,1,1,1,...infer R]?[...F<[G,H],[1]>,R]:[.. …

Vyxal, 8 7 6 bytes ₍↔∪@÷/ Try it Online! -1 thanks to TheThonnu, -1 thanks to Lyxal ₍↔∪@÷/ # implicit input of two lists ₍ # apply each to the stack, and wrap: ↔ # intersection ∪ …

Vyxal j, 31 29 27 bytes yD∆Ŀ~cßdεȮ/‟ʁ≤‛x-i*ƛ\|j\|ø. Try it Online! or Verify some test cases -2 bytes thanks to lyxal :) I'm aware of Vyncode but I'm probably going to stick to regular SBCS bytes in …

Vyxal, 2 bytes ¨² Try it Online! Builtin for infinite powers of 2. Vyxal, 3 bytes Þ∞E Try it Online! Þ∞ Infinite list of positive integers E \$2^x\$

Ruby, 29 26 bytes ->n{(n>0?100:n=-n)/n+=1e2} Attempt This Online! Saved 3 bytes thanks to @MTN and @G B. Ports Luis felipe De jesus Munoz’s JavaScript submission. Ruby, 34 28 bytes ->n{[-n,o=1e2].max …

TypeScript Type System, 98 99 bytes type X<A,B=A>=B extends`1${infer R}`?R extends""?A:B extends A?X<B,X<R>>:`${A&string}${X<R,A>}`:"1" Try it at the TypeScript playground +1 byte to make X<0> work p …

Thunno 2, 7 bytes ×__Fæ2> Attempt This Online! Based on Command Master’s idea, implemented a bit differently × # Multiply. X * Y _ # Swapped subtract. X * Y - X _ # Swa …

Python, 32 bytes f=lambda n,i=1:n==i or f(n,2**i) Attempt This Online! My idea was invalid in JS, because the recursion limit isn't guaranteed, but it's OK in Python because of that difference. Outpu …

Python, 100 bytes from decimal import* getcontext().prec=500 e=d=Decimal(1) for x in range(2,254):e+=1/d;d*=x print(e) Attempt This Online! -2 bytes thanks to RubenVerg 254 is the lowest number which …

Check that answer for a better understanding of the math. Code explanation: 2 4000:a?:b) 2 4000 # Push 2, 4000 to the stack. :a # Store 4000 in variable a. ? …

TypeScript's Type System, 62 bytes type F<V>={[I in keyof V]:{[J in keyof V]:J extends I?V[J]:0}} Try it at the TypeScript Playground! It's been a little while since I've golfed in TS types, so it's …

Ruby, 78 67 59 49 bytes ->a,b{c=0;a.zip(b).map{s=_1+_2+c;c=s>9?1:0;s%10}} Attempt This Online! My first Ruby submission! This is probably a little golfable but I'm pretty happy with it considering I …

Japt -g, 14 bytes x_Ì*3)nZg1)*ZÎ Try it or verify all test cases. Port of @AndrovT's Vyxal answer. Takes -1 for A and 1 for B. Outputs 1 for A, -1 for B, and 0 for draw. x_Ì*3)nZg1)*ZÎ implicit inpu …

Uiua, 15 bytes ⍜⊕□◌.⊞+⟜⇌⇡⌈÷2⧻. Try it: Uiua pad This should be 13 bytes because ⍜⊕□◌. could hypothetically be replaced by ⌝⊕□, but it hasn't been implemented yet. Explanation: ⌈÷2⧻ - Get the side len …

JavaScript, 14 11 bytes -3 thanks to Deadcode f= n=>!(n&n-2) // test numbers 0-16 const tests = [f(0), false, true, false, true, false, false, false, true, false, false, false, false, false, fals …