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8-exercise.ts
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/**
* SnakeToCamelCase
* https://github.com/RossWilliams/ts-case-convert/blob/main/src/caseConvert.ts#L100
*/
// 建立適當的斷句
type SnakeToCamelCase<T extends string> =
T extends `${infer Head}_${infer Tail}`
? `${Uncapitalize<Head>}${Capitalize<SnakeToCamelCase<Tail>>}`
: T;
type T1 = SnakeToCamelCase<'this_is_snake_case'>; // "thisIsSnakeCase"
type T2 = SnakeToCamelCase<'This_Is_Strange_Case'>; // "thisIsStrangeCase"
type T3 = SnakeToCamelCase<'IDontKnowThis'>; // "IDontKnowThis"
/**
* Optional
* https://github.com/piotrwitek/utility-types
*/
type Optional<T extends object, K extends keyof T = keyof T> = Omit<T, K> &
Partial<Pick<T, K>>;
type Conference = {
name: string;
year: number;
isAddToCalendar: boolean;
website: string;
};
type ConferenceWithOptional = Optional<Conference, 'year' | 'isAddToCalendar'>;
// 沒有帶入 Optional 的第二個參數
type ConferenceWithAllOptional = Optional<Conference>;
// 帶入實際的型別幫助理解
type A = Omit<Conference, 'year' | 'isAddToCalendar'>;
type B = Pick<Conference, 'year' | 'isAddToCalendar'>;
type C = Partial<Pick<Conference, 'year' | 'isAddToCalendar'>>;
type Result = A & C;
// 不知道為什麼要這樣時，就拿掉試試看會發生什麼事
type OptionalWithoutDefault<T extends object, K extends keyof T> = Omit<T, K> &
Partial<Pick<T, K>>;
type ConferenceWithAllOptional2 = OptionalWithoutDefault<Conference>;
export {};