Answer1215

摘要： Implement RemoveIndexSignature<T> , exclude the index signature from object types. For example: type Foo = { [key: string]: any; foo(): void; } type A 阅读全文

摘要： The looseness of Object.keys can be a real pain point when using TypeScript. Luckily, it's pretty simple to create a tighter version using generics an 阅读全文

摘要： Type helpers change the game when it comes to types in your codebase. They help TypeScript infer more from your code - and make your types a lot more 阅读全文

摘要： export const getDeepValue = <Obj, FirstKey extends keyof Obj, SecondKey extends keyof Obj[FirstKey]>( obj: Obj, firstKey: FirstKey, secondKey: SecondK 阅读全文

摘要： // begin lesson code import { fromEvent } from 'rxjs'; import { map } from 'rxjs/operators'; /* * Calculate progress based on scroll position */ funct 阅读全文

摘要： The asyncScheduler lets you schedule tasks asynchronously, similar to a setTimeout. All schedulers have a signature of work, delay, state, but provdin 阅读全文

摘要： Provide application level module in bootstrapApplication bootstrapApplication(AppComp, { providers: [ importProvidersFrom(HttpClinetModule) ] }) //BAD 阅读全文

摘要： Write a function that takes in a non-empty array of integers and returns the maximum sum that can be obtained by summing up all of the integers in a n 阅读全文

摘要： Implement a type IsUnion, which takes an input type T and returns whether T resolves to a union type. For example: type case1 = IsUnion<string> // fal 阅读全文

摘要： Implement a type IsNever, which takes input type T. If the type of resolves to never, return true, otherwise false. For example: type A = IsNever<neve 阅读全文