by jiangshan (@jiangshanmeta) #中等 #union
Given an array of unique elements, return all possible subsequences.
A subsequence is a sequence that can be derived from an array by deleting some or no elements without changing the order of the remaining elements.
by Hong (@RThong) #中等 #union #string
判断一个string类型中是否有相同的字符
type CheckRepeatedChars<'abc'> // false
type CheckRepeatedChars<'aba'> // trueby jiangshan (@jiangshanmeta) #中等 #string
Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1. (Inspired by leetcode 387)
by Pineapple (@Pineapple0919) #中等 #array
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.
by Pineapple (@Pineapple0919) #中等 #array
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.
by Krzysztof "Wokay" Łokaj (@wokayme) #中等 #map #object #utils
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
}by Lo (@LoTwT) #中等 #tuple
构造一个给定长度的元组。
例如
type result = ConstructTuple<2> // 期望得到 [unknown, unkonwn]by AaronGuo (@HongxuanG) #中等
Sometimes we want to limit the range of numbers...
For examples.
type result = NumberRange<2 , 9> // | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9by Homyee King (@HomyeeKing) #中等 #array #application #string
Given an array of strings, do Permutation & Combination.
It's also useful for the prop types like video controlsList
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[]> // false