by jiangshan (@jiangshanmeta) #中等 #tuple
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[]> // falseby キリサメ qianxi (@qianxi0410) #中等 #tuple
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
by キリサメ qianxi (@qianxi0410) #中等 #tuple
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.
by Yugang Cao (@Talljack) #中等 #template-literal
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'by jiangshan (@jiangshanmeta) #中等 #template-literal
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> // 12by ch3cknull (@ch3cknull) #中等 #array
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 trueby キリサメ qianxi (@qianxi0410) #中等 #tuple
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]]by jiangshan (@jiangshanmeta) #中等 #array
Implement the type version of Array.shift
For example
type Result = Shift<[3, 2, 1]> // [2, 1]by jiangshan (@jiangshanmeta) #中等 #object #tuple
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 typeby jiangshan (@jiangshanmeta) #中等 #tuple
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']