Updates key value within an array of objects

updateObjInArr.js

const objArr = [
  { letter: 'a', num: 1 },
  { letter: 'b', num: 2 },
  { letter: 'c', num: 3 }
]

const updateObjInArr = (oldArr, searchKey, oldVal, newVal) => {
  return oldArr.map(item => {
    if (item[searchKey] === oldVal) {
      item[searchKey] = newVal
    }

    return item
  })
}

const updatedArr = updateObjInArr(objArr, 'letter', 'c', 'c--updated')

console.log(updatedArr)