implement curry() with placeholder support

Question

This is a follow-up on 1. implement curry()

please implement curry() which also supports placeholder.

Here is an example

const  join = (a, b, c) => {
   return `${a}_${b}_${c}`
}

const curriedJoin = curry(join)
const _ = curry.placeholder

curriedJoin(1, 2, 3) // '1_2_3'

curriedJoin(_, 2)(1, 3) // '1_2_3'

curriedJoin(_, _, _)(1)(_, 3)(2) // '1_2_3'

more to read

https://javascript.info/currying-partials

https://lodash.com/docs/4.17.15#curry

https://github.com/planttheidea/curriable

Code

/**
 * @param { (...args: any[]) => any } fn
 * @returns { (...args: any[]) => any }
 */
function curry(fn) {
  // your code here
}


curry.placeholder = Symbol()

Related

• implement curry()

Source

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