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| type Tuple = [number, string];
interface IPerson { name: string; age: number; }
class Person implements IPerson { name: string; age: number; }
const person: IPerson = { name: "Jay", age: 43, };
interface SayHello { (name: string): string; }
const func: SayHello = (name: string) => { return "hello," + name; };
interface PersonConstructor { new (name: string, age: number): IPerson; }
function createPerson(ctor: PersonConstructor): IPerson { return new ctor("Jay", 43); }
enum Color { RED = "red", YELLOW = "Yellow", BLUE = "blue", }
const color = Color.RED;
type v = void;
type nv = never; type nv_and_str1 = never & "123"; type nv_and_str2 = `${never}${"123"}`; type nv_and_num1 = never & 321; type nv_and_num2 = `${never}${1}`;
type a = any;
type uk = unknown;
interface IAnimal { name: string; weight?: number; }
type res = 1 extends 2 ? true : false;
type isTwo<T> = T extends 2 ? true : false;
type one = isTwo<1>;
type two = isTwo<2>;
type first_name = "Jay"; type last_name = "Chou"; type the_man = `${first_name} ${last_name}`;
type name = "Jay,Chou"; type surname = name extends `Jay,${infer rest}` ? rest : never; type jay = name extends `${infer x},${infer y}` ? x : never;
type First<Tuple extends unknown[]> = Tuple extends [infer T, ...infer R] ? T : never;
type getFirst = First<[1, 2, 3]>; type getFirst2 = First<[]>;
type Second<Tuple extends unknown[]> = Tuple extends [any, infer T, ...infer R] ? T : never;
type getSec = Second<[1, 2, 3]>;
type Last<Arr extends unknown[]> = Arr extends [...any, infer T] ? T : never;
type getLast = Last<[1, 2, 3]>;
type Rest<Arr extends unknown[]> = Arr extends [...infer R, unknown] ? R : never;
type getRest = Rest<[1, 2, 3]>;
type Rest2<Arr extends unknown[]> = Arr extends [unknown, ...infer R] ? R : never;
type getRest2 = Rest2<[1, 2, 3]>;
type arr = unknown[];
type a_or_b = 1 | 2;
type ObjType = { a: number } & { b: boolean };
type o = { a: number; b: boolean } extends ObjType ? true : false;
type ee = "str" & 100;
type person = { name: "jay"; age: 43; }; type values = person[keyof person];
type person2 = { [key in keyof person]: person[key]; };
type MapType<T> = { [Key in keyof T]?: [T[Key], T[Key], "new CD!"]; };
type mt = MapType<{ name: "jay"; age: 43 }>;
type MapType2<T> = { [Key in keyof T as `${Key & string}${Key & string}`]: [ T[Key], T[Key], T[Key] ]; }; type mt2 = MapType2<{ name: "jay"; age: 43 }>;
type StartsWith< Str extends string, Perfix extends string > = Str extends `${Perfix}${string}` ? true : false;
type sw = StartsWith<"Jay Chou", "Jay">;
type sw2 = StartsWith<"Jay Chou", "Lin">;
type Replace< Str extends string, From extends string, To extends string > = Str extends `${infer P}${From}${infer S}` ? `${P}${To}${S}` : Str;
type rp = Replace<"Jay Shou", "S", "Z">; type rp2 = Replace<"Jay Shou", "X", "S">;
type TrimRight<Str extends string> = Str extends `${infer Rest}${ | " " | "\n" | "\t"}` ? TrimRight<Rest> : Str;
type tr = TrimRight<"Jay Zhou ">;
type TrimLeft<Str extends string> = Str extends `${ | " " | "\n" | "\t"}${infer Rest}` ? TrimLeft<Rest> : Str;
type tl = TrimLeft<" Jay Zhou">;
type tm = TrimRight< TrimLeft<` Jay Zhou
`> >;
function createCD(name: string, price: number) { return { name, price, author: "Jay Chou" }; }
type GetArgsOfFunc<Func extends Function> = Func extends ( ...args: infer Args ) => unknown ? Args : never;
type gaf = GetArgsOfFunc<typeof createCD>;
type GetArgsOfFunc2<Func extends Function> = Func extends ( aa: infer A, bb: infer B ) => unknown ? [A, B] : never;
type gaf2 = GetArgsOfFunc2<typeof createCD>;
type GetReturnOfFunc<Func extends Function> = Func extends ( ...args ) => infer Return ? Return : never;
type grf = GetReturnOfFunc<typeof createCD>;
type grf2 = GetReturnOfFunc<() => "J">;
type Push<Arr extends unknown[], Ele> = [...Arr, Ele];
type pushRes = Push<[1, 2, 3], 4>;
type Unshift<Arr extends unknown[], Ele> = [Ele, ...Arr];
type unshiftRes = Unshift<[1, 2, 3], 4>;
type Zip< Arr1 extends [unknown, unknown], Arr2 extends [unknown, unknown] > = Arr1 extends [infer v1_1, infer v1_2] ? Arr2 extends [infer v2_1, infer v2_2] ? [[v1_1, v2_1], [v1_2, v2_2]] : [] : [];
type zipRes = Zip<[1, 2], ["Jay Chou", "Lin Junjie"]>;
type Zip2<Arr1 extends unknown[], Arr2 extends unknown[]> = Arr1 extends [ infer v1_1, ...infer Rest1 ] ? Arr2 extends [infer v2_1, ...infer Rest2] ? [[v1_1, v2_1], ...Zip2<Rest1, Rest2>] : [] : [];
type zip2Res = Zip2<[1, 2, 3], ["Jay Chou", "Lin Junjie", "Mikael J"]>;
type CapitializeStr<Str extends string> = Str extends `${infer First}${infer Rest}` ? `${Uppercase<First>}${Rest}` : Str;
type capitializeStrRes = CapitializeStr<"jay">;
type CamelCase<Str extends string> = Str extends `${infer first}_${infer rest}` ? `${CapitializeStr<first>}${CamelCase<rest>}` : CapitializeStr<Str>;
type camelCaseRes = CamelCase<"hi_jay_chou">;
type CamelCase2<Str extends string> = Str extends `${infer first}_${infer right}${infer rest}` ? `${first}${Uppercase<right>}${CamelCase2<rest>}` : Str;
type camelCaseRes2 = CamelCase2<"hi_jay_chou">;
type AppendArgument<Func extends Function, Arg> = Func extends ( ...args: infer Args ) => infer ReturnType ? (...args: [...Args, Arg]) => ReturnType : never;
type appendArgumentRes = AppendArgument<(name: string) => void, number>;
type UppercaseKey<Obj extends object> = { [Key in keyof Obj as Uppercase<Key & string>]: Obj[Key]; };
type cd = UppercaseKey<{ name: string; price: number }>;
type ToReadonly<T extends Record<string, any>> = { readonly [key in keyof T]: T[key]; };
type toReadonlyRes = ToReadonly<{ name: "chopin"; price: 99 }>;
type ToPartial<T> = { [key in keyof T]?: T[key]; };
type toReadonlyToPartialRes = ToPartial<{ name: "chopin"; price: 99 }>;
type ToMutable<T> = { -readonly [key in keyof T]: T[key]; };
type toMutableRes = ToMutable<{ readonly name: "chopin"; readonly price: 99 }>;
type ToRequired<T> = { [key in keyof T]-?: T[key]; };
type toRequiredRes = ToRequired<{ name?: "chopin"; price?: 99 }>;
type Filter<Obj extends Record<string, any>, ValueType> = { [key in keyof Obj as ValueType extends Obj[key] ? key : never]: Obj[key]; };
interface CD { name: string; price: number; artists: string[]; }
type FilterRes = Filter<CD, string | number>;
type IsEqual<A, B> = (A extends B ? true : false) & (B extends A ? true : false); type isEqualRes = IsEqual<1, 1>; type isEqualRes2 = IsEqual<{ name: "jay" }, { name: "jay" }>;
type IsInclude<Arr extends unknown[], Item> = Arr extends [ infer First, ...infer Rest ] ? IsEqual<First, Item> extends true ? true : IsInclude<Rest, Item> : false;
type isIncludeRes = IsInclude<[1, 2, 3], 1>;
type isIncludeRes2 = IsInclude<[1, 2, 3], 4>;
type RemoveItem< Arr extends unknown[], Item, Res extends unknown[] = [] > = Arr extends [infer First, ...infer Rest] ? IsEqual<First, Item> extends true ? RemoveItem<Rest, Item, Res> : RemoveItem<Rest, Item, [...Res, First]> : Res;
type removeItemRes = RemoveItem<[1, 2, 1, 3, 1], 1>;
type removeItemRes2 = RemoveItem<[1, 2, 3], 4>;
type ReplaceAll< Str extends string, From extends string, To extends string > = Str extends `${infer First}${infer Rest}` ? IsEqual<First, From> extends true ? `${To}${ReplaceAll<Rest, From, To>}` : `${First}${ReplaceAll<Rest, From, To>}` : Str;
type ReplaceAll2< Str extends string, From extends string, To extends string > = Str extends `${infer Left}${From}${infer Rest}` ? `${Left}${To}${ReplaceAll<Rest, From, To>}` : Str;
type replaceAllRes = ReplaceAll<"1J1a1y", "1", "">; type replaceAllRes2 = ReplaceAll2<"1J1a1y", "1", "">;
type StrUnion<Str extends string> = Str extends `${infer First}${infer Rest}` ? First | StrUnion<Rest> : never;
type strUnionRes = StrUnion<"Jay">;
type ReverseStr<Str extends string> = Str extends `${infer First}${infer Rest}` ? `${ReverseStr<Rest>}${First}` : Str;
type reverseStrRes = ReverseStr<"yaJ">;
type DeepReadonly<Obj extends Record<string, any>> = { readonly [Key in keyof Obj]: Obj[Key] extends object ? DeepReadonly<Obj[Key]> : Obj[Key]; };
const deepObj = { a: { b: { c: "1", d: "2" } } };
type DeepReadonlyRes = DeepReadonly<typeof deepObj>; type DeepReadonlyResA = DeepReadonly<typeof deepObj>["a"]; type DeepReadonlyResAB = DeepReadonly<typeof deepObj>["a"]["b"];
type NumTwo = [any, any]["length"];
type BuildArr< Len extends number, Arr extends unknown[] = [] > = Arr["length"] extends Len ? Arr : BuildArr<Len, [...Arr, unknown]>;
type Len2Array = BuildArr<2>;
type Add<Num1 extends number, Num2 extends number> = [ ...BuildArr<Num1>, ...BuildArr<Num2> ]["length"];
type add1And2 = Add<1, 2>;
type Sub<Num1 extends number, Num2 extends number> = BuildArr<Num1> extends [ ...BuildArr<Num2>, ...infer Rest ] ? Rest["length"] : never;
type subOneTwo = Sub<4, 1>;
type Subtract< Num1 extends number, Num2 extends number > = BuildArr<Num1> extends [...arr1: BuildArr<Num2>, ...arr2: infer Rest] ? Rest["length"] : never;
type subOneTwo2 = Subtract<2, 1>;
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