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TypeScriptの型で世界のナベアツ
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type Natural = 0[]; | |
type Zero = []; | |
type One = [0]; | |
type AhoSuffix = '(アホ)'; | |
type Length<Array extends unknown[]> = Extract<Array['length'], number>; | |
type Add<N1 extends Natural, N2 extends Natural> = [...N1, ...N2]; | |
type AddNum<N1 extends number, N2 extends number> = Length<[...NumToNat<N1>, ...NumToNat<N2>]>; | |
type Sub<N1 extends Natural, N2 extends Natural> = N1 extends [...N2, ...infer M] | |
? M | |
: never; | |
type IsStrictlySmaller<N1 extends Natural, N2 extends Natural> = Sub<N1, N2> extends never | |
? true | |
: false; | |
type IsDivisible<N1 extends Natural, N2 extends Natural> = N1 extends Zero | |
? true | |
: IsStrictlySmaller<N1, N2> extends true | |
? false | |
: IsDivisible<Sub<N1, N2>, N2>; | |
type NatToNum<N extends Natural> = Length<N>; | |
type NumToNat<N extends number, M extends Natural = []> = Length<M> extends N | |
? M | |
: NumToNat<N, Add<M, One>>; | |
type IsIncludeThree<N extends number> = `${N}` extends `${infer _N}${3}${infer _M}` | |
? true | |
: false; | |
type IsMultipleOfThree<N extends number> = IsDivisible<NumToNat<N>, NumToNat<3>>; | |
type IsAho<N extends number> = IsIncludeThree<N> extends true | |
? true | |
: IsMultipleOfThree<N> extends true | |
? true | |
: false; | |
type Aho<N extends number> = IsAho<N> extends true | |
? `${N}${AhoSuffix}` | |
: `${N}`; | |
type AhoRange<L extends number, Result extends string[] = []> = Length<Result> extends L | |
? Result | |
: AhoRange<L, [...Result, Aho<AddNum<Length<Result>, 1>>]> | |
type Aho1 = Aho<1>; // '1' | |
type Aho3 = Aho<3>; // '3(アホ)' | |
type Aho5 = Aho<5>; // '5' | |
type Aho9 = Aho<9>; // '9(アホ)' | |
type Aho10 = Aho<10>; // '10' | |
type Aho13 = Aho<13>; // '13(アホ)' | |
type Aho1_50 = AhoRange<50>; | |
// ['1', '2', '3(アホ)', '4', '5', '6(アホ)', '7', '8', '9(アホ)', '10', '11', '12(アホ)', '13(アホ)', '14', '15(アホ)', '16', '17', '18(アホ)', '19', '20', '21(アホ)', '22', '23(アホ)', '24(アホ)', '25', '26', '27(アホ)', '28', '29', '30(アホ)', '31(アホ)', '32(アホ)', '33(アホ)', '34(アホ)', '35(アホ)', '36(アホ)', '37(アホ)', '38(アホ)', '39(アホ)', '40', '41', '42(アホ)', '43(アホ)', '44', '45(アホ)', '46', '47', '48(アホ)', '49', '50'] |
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