随笔分类 - TypeScript
摘要：Let's say we have type TemplateLiteralKey = `${"user" | "post" | "comment"}${"Id" | "Name"}`; We want to make a type type ObjectOfKeys = unknown; In o
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摘要：Here we have a Sandwich type that's currently assigned to unknown We also have a couple of union types, BreadType and Filling, that have several optio
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摘要：Let's say we have an object as const: const frontendToBackendEnumMap = { singleModule: "SINGLE_MODULE", multiModule: "MULTI_MODULE", sharedModule: "SH
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摘要：Let's say we have a const of object: export const programModeEnumMap = { GROUP: "group", ANNOUNCEMENT: "announcement", ONE_ON_ONE: "1on1", SELF_DIRECT
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摘要：For example we have a discriminated union type: export type Event = | { type: "click"; event: MouseEvent; } | { type: "focus"; event: FocusEvent; } |
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摘要：Give a discriminated union: export type Event = | { type: "click"; event: MouseEvent; } | { type: "focus"; event: FocusEvent; } | { type: "keydown"; e
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摘要：Implement the type Filter<T, Predicate> takes an Array T, primitive type or union primitive type Predicate and returns an Array include the elements o
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摘要：Returns true if all elements of the list are equal to the second parameter passed in, false if there are any mismatches. For example type Test1 = [1,
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摘要：You're required to implement a type-level parser to parse URL query string into a object literal type. Some detailed requirements: Value of a key in q
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摘要：Given an union of types and array of type pairs to replace ([[string, number], [Date, null]]), return a new union replaced with the type pairs. /* ___
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摘要：Capitalize the key of the object, and if the value is an array, iterate through the objects in the array. /* _____________ Your Code Here ____________
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摘要：You have a target object and a source array of objects. You need to copy property from source to target, if it has the same property as the source, yo
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摘要：Given an array of integers nums and an integer target, return true if two numbers such that they add up to target. /* _____________ Your Code Here ___
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摘要：Get all possible paths that could be called by _.get (a lodash function) to get the value of an object type T1 = ObjectKeyPaths<{ name: string; age: n
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摘要：Implement BinaryToDecimal<S> which takes an exact string type S consisting 0 and 1 and returns an exact number type corresponding with S when S is reg
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摘要：Implement the type version of Lodash.intersection with a little difference. Intersection takes an Array T containing several arrays or any type elemen
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摘要：type RGB = [number, number, number] const palette: Record<'red' | 'blue' | 'green', string | RGB> = { red: [255, 0, 0], green: "#00ff00", blue: [0,0,2
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摘要：Typescript 4.9 supports an upcoming feature: Auto-accessors: class Person { accessor name: string constructor(name: string) { this.name = name } } Und
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摘要：Before version 4.9, you will get type error for the code: interface Context { packageJSON: unknown } function tryGetPackageName(context: Context) { co
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摘要：Implement the advanced util type MutableKeys, which picks all the mutable (not readonly) keys into a union. For example: type Keys = MutableKeys<{ rea
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