Flip 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.
For example:
type Flipped = FlipArguments<(arg0: string, arg1: number, arg2: boolean) => void>
// (arg0: boolean, arg1: number, arg2: string) => void解题思路
待补充
答案
type FlipArguments<T> = any验证
import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<FlipArguments<() => boolean>, () => boolean>>,
Expect<Equal<FlipArguments<(foo: string) => number>, (foo: string) => number>>,
Expect<Equal<FlipArguments<(arg0: string, arg1: number, arg2: boolean) => void>, (arg0: boolean, arg1: number, arg2: string) => void>>,
]
type errors = [
// @ts-expect-error
FlipArguments<'string'>,
// @ts-expect-error
FlipArguments<{ key: 'value' }>,
// @ts-expect-error
FlipArguments<['apple', 'banana', 100, { a: 1 }]>,
// @ts-expect-error
FlipArguments<null | undefined>,
]参考
无
