Combination
题目
Given an array of strings, do Permutation & Combination. It's also useful for the prop types like video controlsList
// expected to be `"foo" | "bar" | "baz" | "foo bar" | "foo bar baz" | "foo baz" | "foo baz bar" | "bar foo" | "bar foo baz" | "bar baz" | "bar baz foo" | "baz foo" | "baz foo bar" | "baz bar" | "baz bar foo"`
type Keys = Combination<['foo', 'bar', 'baz']>解题思路
待补充
答案
type Combination<T extends string[]> = any验证
import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Combination<['foo', 'bar', 'baz']>, 'foo' | 'bar' | 'baz' | 'foo bar' | 'foo bar baz' | 'foo baz' | 'foo baz bar' | 'bar foo' | 'bar foo baz' | 'bar baz' | 'bar baz foo' | 'baz foo' | 'baz foo bar' | 'baz bar' | 'baz bar foo'>>,
Expect<Equal<Combination<['apple', 'banana', 'cherry']>, 'apple' | 'banana' | 'cherry'
| 'apple banana' | 'apple cherry' | 'banana apple' | 'banana cherry' | 'cherry apple' | 'cherry banana'
| 'apple banana cherry' | 'apple cherry banana' | 'banana apple cherry' | 'banana cherry apple' | 'cherry apple banana' | 'cherry banana apple'>>,
Expect<Equal<Combination<['red', 'green', 'blue', 'yellow']>, 'red' | 'green' | 'blue' | 'yellow'
| 'red green' | 'red blue' | 'red yellow' | 'green red' | 'green blue' | 'green yellow' | 'blue red' | 'blue green' | 'blue yellow' | 'yellow red' | 'yellow green' | 'yellow blue'
| 'red green blue' | 'red green yellow' | 'red blue green' | 'red blue yellow' | 'red yellow green' | 'red yellow blue'
| 'green red blue' | 'green red yellow' | 'green blue red' | 'green blue yellow' | 'green yellow red' | 'green yellow blue'
| 'blue red green' | 'blue red yellow' | 'blue green red' | 'blue green yellow' | 'blue yellow red' | 'blue yellow green'
| 'yellow red green' | 'yellow red blue' | 'yellow green red' | 'yellow green blue' | 'yellow blue red' | 'yellow blue green'
| 'red green blue yellow' | 'red green yellow blue' | 'red blue green yellow' | 'red blue yellow green' | 'red yellow green blue' | 'red yellow blue green'
| 'green red blue yellow' | 'green red yellow blue' | 'green blue red yellow' | 'green blue yellow red' | 'green yellow red blue' | 'green yellow blue red'
| 'blue red green yellow' | 'blue red yellow green' | 'blue green red yellow' | 'blue green yellow red' | 'blue yellow red green' | 'blue yellow green red'
| 'yellow red green blue' | 'yellow red blue green' | 'yellow green red blue' | 'yellow green blue red' | 'yellow blue red green' | 'yellow blue green red'>>,
Expect<Equal<Combination<['one', 'two']>, 'one' | 'two'
| 'one two' | 'two one'>>,
]参考
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