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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

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

4803 - Trim Right

by Yugang Cao (@Talljack) #中等 #template-literal

题目

实现 TrimRight<T> ，它接收确定的字符串类型并返回一个新的字符串，其中新返回的字符串删除了原字符串结尾的空白字符串。

例如

type Trimed = TrimRight<'  Hello World  '> // 应推导出 '  Hello World'

fxss原创2025/6/27小于 1 分钟

5140 - Trunc

by jiangshan (@jiangshanmeta) #中等 #template-literal

题目

Implement the type version of Math.trunc, which takes string or number and returns the integer part of a number by removing any fractional digits.

For example:

type A = Trunc<12.34> // 12

fxss原创2025/6/27小于 1 分钟

4425 - Greater Than

by ch3cknull (@ch3cknull) #中等 #array

题目

In This Challenge, You should implement a type GreaterThan<T, U> like T > U

Negative numbers do not need to be considered.

For example

GreaterThan<2, 1> //should be true
GreaterThan<1, 1> //should be false
GreaterThan<10, 100> //should be false
GreaterThan<111, 11> //should be true

fxss原创2025/5/8大约 1 分钟

4471 - Zip

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

题目

In This Challenge, You should implement a type Zip<T, U>, T and U must be Tuple

type exp = Zip<[1, 2], [true, false]> // expected to be [[1, true], [2, false]]

fxss原创2025/5/8小于 1 分钟

3062 - Shift

by jiangshan (@jiangshanmeta) #中等 #array

题目

Implement the type version of Array.shift

For example

type Result = Shift<[3, 2, 1]> // [2, 1]

fxss原创2025/5/7小于 1 分钟

3188 - Tuple to Nested Object

by jiangshan (@jiangshanmeta) #中等 #object #tuple

题目

Given a tuple type T that only contains string type, and a type U, build an object recursively.

type a = TupleToNestedObject<['a'], string> // {a: string}
type b = TupleToNestedObject<['a', 'b'], number> // {a: {b: number}}
type c = TupleToNestedObject<[], boolean> // boolean. if the tuple is empty, just return the U type

fxss原创2025/5/7小于 1 分钟