TypeScript 4.0 is recommended in this challenge
Currying is the technique of converting a function that takes multiple arguments into a sequence of functions that each take a single argument.
For example:
const add = (a: number, b: number) => a + b
const three = add(1, 2)
const curriedAdd = Currying(add)
const five = curriedAdd(2)(3)
The function passed to Currying may have multiple arguments, you need to correctly type it.
In this challenge, the curried function only accept one argument at a time. Once all the argument is assigned, it should return its result.
import type { Equal, Expect } from '@type-challenges/utils'
const curried1 = Currying((a: string, b: number, c: boolean) => true)
const curried2 = Currying((a: string, b: number, c: boolean, d: boolean, e: boolean, f: string, g: boolean) => true)
const curried3 = Currying(() => true)
type cases = [
Expect<Equal<
typeof curried1,
(a: string) => (b: number) => (c: boolean) => true
>>,
Expect<Equal<
typeof curried2,
(a: string) => (b: number) => (c: boolean) => (d: boolean) => (e: boolean) => (f: string) => (g: boolean) => true
>>,
Expect<Equal<typeof curried3, () => true>>,
]