rambda/src/modifyItemAtIndex.js

Lightweight and faster alternative to Ramda with included TS definitions

import { cloneList } from './_internals/cloneList.js'

export function modifyItemAtIndex(index, replaceFn) {
  return list => {
    const actualIndex = index < 0 ? list.length + index : index
    if (index >= list.length || actualIndex < 0) {
      return list
    }

    const clone = cloneList(list)
    clone[actualIndex] = replaceFn(clone[actualIndex])

    return clone
  }
}