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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

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

3192 - Reverse

by jiangshan (@jiangshanmeta) #中等 #tuple

题目

实现类型版本的数组反转 Array.reverse

例如：

type a = Reverse<['a', 'b']> // ['b', 'a']
type b = Reverse<['a', 'b', 'c']> // ['c', 'b', 'a']

fxss原创2025/5/7小于 1 分钟

3196 - Flip Arguments

by jiangshan (@jiangshanmeta) #中等 #arguments

题目

Implement the type version of lodash's _.flip.

Type FlipArguments<T> requires function type T and returns a new function type which has the same return type of T but reversed parameters.

fxss原创2025/5/7小于 1 分钟

3243 - FlattenDepth

by jiangshan (@jiangshanmeta) #中等 #array

题目

Recursively flatten array up to depth times.

For example:

type a = FlattenDepth<[1, 2, [3, 4], [[[5]]]], 2> // [1, 2, 3, 4, [5]]. flattern 2 times
type b = FlattenDepth<[1, 2, [3, 4], [[[5]]]]> // [1, 2, 3, 4, [[5]]]. Depth defaults to be 1

fxss原创2025/5/7大约 1 分钟

3326 - BEM style string

by Songhn (@songhn233) #中等 #template-literal #union #tuple

题目

The Block, Element, Modifier methodology (BEM) is a popular naming convention for classes in CSS.

For example, the block component would be represented as btn, element that depends upon the block would be represented as btn__price, modifier that changes the style of the block would be represented as btn--big or btn__price--warning.

fxss原创2025/5/7小于 1 分钟

4179 - Flip

by Farhan Kathawala (@kathawala) #中等 #object

题目

Implement the type of just-flip-object. Examples:

Flip<{ a: "x", b: "y", c: "z" }>; // {x: 'a', y: 'b', z: 'c'}
Flip<{ a: 1, b: 2, c: 3 }>; // {1: 'a', 2: 'b', 3: 'c'}
Flip<{ a: false, b: true }>; // {false: 'a', true: 'b'}

fxss原创2025/5/7小于 1 分钟