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阅读提示：
每个方法都有相应的描述、语法、参数、返回值、注意项（可选）、例子（可选）。
语法中的[]里面中的内容表示参数为可选参数。

`Array.from()`

描述：从一个类似数组或可迭代对象中创建一个新的数组实例。

语法：

new_array = Array.from(arrayLike[, callback(element[, index[, array]])[, thisArg]]);

fxss原创2020/3/12大约 23 分钟

5153 - IndexOf

by Pineapple (@Pineapple0919) #中等 #array

题目

Implement the type version of Array.indexOf, indexOf<T, U> takes an Array T, any U and returns the index of the first U in Array T.

fxss原创2025/7/3小于 1 分钟

5310 - Join

by Pineapple (@Pineapple0919) #中等 #array

题目

Implement the type version of Array.join, Join<T, U> takes an Array T, string or number U and returns the Array T with U stitching up.

fxss原创2025/7/3小于 1 分钟

5821 - MapTypes

by Krzysztof "Wokay" Łokaj (@wokayme) #中等 #map #object #utils

题目

Implement MapTypes<T, R> which will transform types in object T to different types defined by type R which has the following structure

type StringToNumber = {
  mapFrom: string; // value of key which value is string
  mapTo: number; // will be transformed for number
}

fxss原创2025/7/3大约 1 分钟

7544 - Construct Tuple

by Lo (@LoTwT) #中等 #tuple

题目

构造一个给定长度的元组。

例如

type result = ConstructTuple<2> // 期望得到 [unknown, unkonwn]

fxss原创2025/7/3小于 1 分钟

8640 - Number Range

by AaronGuo (@HongxuanG) #中等

题目

Sometimes we want to limit the range of numbers...
For examples.

type result = NumberRange<2 , 9> //  | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

fxss原创2025/7/3大约 1 分钟

8767 - Combination

by Homyee King (@HomyeeKing) #中等 #array #application #string

题目

Given an array of strings, do Permutation & Combination.
It's also useful for the prop types like video controlsList

fxss原创2025/7/3大约 2 分钟

4484 - IsTuple

by jiangshan (@jiangshanmeta) #中等 #tuple

题目

Implement a type IsTuple, which takes an input type T and returns whether T is tuple type.

For example:

type case1 = IsTuple<[number]> // true
type case2 = IsTuple<readonly [number]> // true
type case3 = IsTuple<number[]> // false

fxss原创2025/6/27小于 1 分钟

4499 - Chunk

by キリサメ qianxi (@qianxi0410) #中等 #tuple

题目

Do you know lodash? Chunk is a very useful function in it, now let's implement it.
Chunk<T, N> accepts two required type parameters, the T must be a tuple, and the N must be an integer >=1

fxss原创2025/6/27小于 1 分钟

4518 - Fill

by キリサメ qianxi (@qianxi0410) #中等 #tuple

题目

Fill, a common JavaScript function, now let us implement it with types.
Fill<T, N, Start?, End?>, as you can see,Fill accepts four types of parameters, of which T and N are required parameters, and Start and End are optional parameters.
The requirements for these parameters are: T must be a tuple, N can be any type of value, Start and End must be integers greater than or equal to 0.

fxss原创2025/6/27大约 1 分钟