随笔分类 - TypeScript
摘要：namespace AllGreetings { export namespace Greetings { export function returnGreeting (greeting: string) { console.log(`The message from namespace Gree
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摘要：Chainable options are commonly used in Javascript. But when we switch to TypeScript, can you properly type it? In this challenge, you need to type an
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摘要：Implement a generic TupleToUnion<T> which covers the values of a tuple to its values union. For example type Arr = ['1', '2', '3'] type Test = TupleTo
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摘要：Implement a generic DeepReadonly<T> which make every parameter of an object - and its sub-objects recursively - readonly. You can assume that we are o
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摘要：Implement a generic MyReadonly2<T, K> which takes two type argument T and K. K specify the set of properties of T that should set to Readonly. When K
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摘要：Implement the built-in Omit<T, K> generic without using it. Constructs a type by picking all properties from T and then removing K For example interfa
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摘要：Implement the built-in ReturnType<T> generic without using it. For example const fn = (v: boolean) => { if (v) return 1 else return 2 } type a = MyRet
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摘要：Implement the built-in Parameters generic without using it. For example: const foo = (arg1: string, arg2: number): void => {} type FunctionParamsType
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摘要：Implement the type version of Array.unshift For example: type Result = Unshift<[1, 2], 0> // [0, 1, 2,] /* _____________ Your Code Here _____________
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摘要：Implement the generic version of Array.push For example: type Result = Push<[1, 2], '3'> // [1, 2, '3'] /* _____________ Your Code Here _____________
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摘要：Implement the Equal<T, U> For example: type isEqual = Equal<1, 1> // true Idea: Parameter type: <P>(x: P) => any Check P extends T ? 1: 2 Then check P
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摘要：Implement the JavaScript Array.includes function in the type system. A type takes the two arguments. The output should be a boolean true or false. For
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摘要：Implement the JavaScript Array.concat function in the type system. A type takes the two arguments. The output should be a new array that includes inpu
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摘要：Implement a utils If which accepts condition C, a truthy return type T, and a falsy return type F. C is expected to be either true or false while T an
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摘要：If we have a type which is wrapped type like Promise. How we can get a type which is inside the wrapped type? For example: if we have Promise<ExampleT
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摘要：Implement the built-in Exclude<T, U> For example: type Result = MyExclude<'a' | 'b' | 'c', 'a'> // 'b' | 'c' /* _____________ Your Code Here _________
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摘要：For given a tuple, you need create a generic Length, pick the length of the tuple For example: type tesla = ['tesla', 'model 3', 'model X', 'model Y']
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摘要：Implement a generic First<T> that takes an Array T and returns it's first element's type. type arr1 = ['a', 'b', 'c'] type arr2 = [3, 2, 1] type head1
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摘要：For example: const tuple = ['tesla', 'model 3', 'model X', 'model Y'] as const type result = TupleToObject<typeof tuple> // expected { tesla: 'tesla',
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摘要：For example: interface Todo { title: string description: string } const todo: MyReadonly<Todo> = { title: "Hey", description: "foobar" } todo.title =
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