type-challenges | Collection of TypeScript type challenges with online judge | Frontend Framework library

by type-challenges TypeScript Version: Current License: MIT

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kandi X-RAY | type-challenges Summary

type-challenges is a TypeScript library typically used in User Interface, Frontend Framework, React, Nodejs applications. type-challenges has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Collection of TypeScript type challenges. English | 简体中文 | 日本語 | 한국어.

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type-challenges has a medium active ecosystem.

It has 34514 star(s) with 3614 fork(s). There are 136 watchers for this library.

It had no major release in the last 6 months.

There are 24852 open issues and 2673 have been closed. On average issues are closed in 0 days. There are 23 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of type-challenges is current.

Quality

type-challenges has 0 bugs and 0 code smells.

Security

type-challenges has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

type-challenges code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

type-challenges is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

type-challenges releases are not available. You will need to build from source code and install.

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type-challenges Key Features

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Community Discussions

Trending Discussions on type-challenges

TypeScript spread operator transform boolean to true | false when type compute

Recursively typed function definition in typescript

what's the difference between the two Pick util type implementations

How to declare a class type with type aliases?

what is "extends never" used for?

What's the difference between string[] and non-fixed-length string tuple?

Typescript Symbol.species typing inference

QUESTION

TypeScript spread operator transform boolean to true | false when type compute

Asked 2022-Mar-25 at 22:16

I'm taking type-challenge exercise with the easy part, implement the type version of Unshift.(https://github.com/type-challenges/type-challenges/tree/master/questions/3060-easy-unshift) Here is my code:

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ANSWER

Answered 2022-Mar-25 at 22:16

The reason you get a union result type is that boolean is a union (true | false) and conditional types distribute over union types (docs). Because of this, Unshift<['1', 2, '3'], boolean> evaluates to Unshift<['1', 2, '3'], true> | Unshift<['1', 2, '3'], false>.

You can prevent it from happening by surrounding both sides of the extends condition with square brackets:

Source https://stackoverflow.com/questions/71623337

QUESTION

Recursively typed function definition in typescript

Asked 2022-Mar-08 at 00:09

I have the following type in typescript:

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ANSWER

Answered 2022-Mar-07 at 22:11

This can be achieved with classes and generics. You could also go with using functions and returning objects, but I find it easier with classes. Here's a possible solution:

Source https://stackoverflow.com/questions/71387427

QUESTION

what's the difference between the two Pick util type implementations

Asked 2022-Jan-11 at 09:08

I'm trying this: https://github.com/type-challenges/type-challenges/blob/master/questions/4-easy-pick/README.md

I can't understand the difference between them:

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ANSWER

Answered 2022-Jan-11 at 09:08

First MyPick:

Source https://stackoverflow.com/questions/70663294

QUESTION

How to declare a class type with type aliases?

Asked 2021-Nov-15 at 12:01

@type-challenges/utils.ts

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ANSWER

Answered 2021-Aug-15 at 09:16

TPoint is defined as having the new OR the prototype attributes. It's a union type.

While typeof Point has necessarily both, it's a sum type.

A + B is a subset of A | B but the reverse is not true.

If you want the sum type, you can write TPoint like this instead:

Source https://stackoverflow.com/questions/68788959

QUESTION

what is "extends never" used for?

Asked 2021-Aug-07 at 14:58

Here is an implementation of DeepReadonly (taken from here, which is a solution to this challenge).

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ANSWER

Answered 2021-Aug-07 at 14:47

I have all the same questions you do, I think. The short answer is that I don't think it's a great implementation of DeepReadonly, with no offense meant to whoever wrote it.

So keyof T extends never means that there are no known keys of the T type, since the keyof operator produces a union of known keys, and the never type is TypeScript's bottom type, a type which has no values at all. That means keyof T extends never behaves like this:

Source https://stackoverflow.com/questions/68693054

QUESTION

What's the difference between string[] and non-fixed-length string tuple?

Asked 2021-Aug-01 at 13:24

import {Equal} from '@type-challenges/utils';
type StringTuple = [string, ...string[]]; // Tuples also support rest elements
let d: StringTuple = ['a', 'b', 'c'];
let e: StringTuple = ['a', 'b', 'c', 'd', 'e'];
type R = Equal; // false

...

ANSWER

Answered 2021-Aug-01 at 13:15

Your StringTuple is defined as starting with a string. You can't e.g. assign an empty array (or even string[]!) to a StringTuple variable:

Source https://stackoverflow.com/questions/68610761

QUESTION

Typescript Symbol.species typing inference

Asked 2021-Jun-03 at 19:57

Let's say I have a custom MyArray class that extends upon the builtin Array class, how should I type so that myMap(myArr: MyArray, ) can correctly infer the return type as MyArray, instead of the builtin Array?

PS: I want this type declaration to be as general as possible, which is why I didn't simply overload the map method. That way, I can easily change the signature for type variable Arr in myArr to Iterable, and this can also be used on other builtin/custom classes like Set that implements the Iterable Protocol. Right now the best I could do is to have the user specify their desired return type as a generic function variable.

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ANSWER

Answered 2021-Jun-03 at 19:57

I believe you dont have to specify any static properties, because then you have to implement them all.

Since you want to override some of Array.prototype methods, I think it is better to type only those methods which you are interested in.

Source https://stackoverflow.com/questions/67815551

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