create array of objects from an array of string ids with 1st object having first value with second, second with third and so on

I have an array of strings e.g. const array1 = ["124542", "112244", "112245", "112246"];

I want to create below results:

const array2 = [
  {
    "comparableId": "124542",
    "comparatorId": "112244"
  },
  {
    "comparableId": "112244",
    "comparatorId": "112245"
  },
  {
    "comparableId": "112245",
    "comparatorId": "112246"
  }
]

In this array2, 1st index value from array1 is with 2nd value, 2nd value with 3rd and 3rd with 4th and so on. This array1 is dynamic and can have just 1 value e.g. const array1 = ["124542"]; and can have any number of values.

I have tried using Ecma Script reduce and map methods.

const array2 = array1.map((value, index) => {
    return {
       comparableId: value,
       comparatorId: array1[index + 1] || '',
    };
});

Is there some other good way to do it ?

>Solution :

Using a for loop is probably the easiest here.

const array1 = ["124542", "112244", "112245", "112246"];


const transform = (array) => {
  const result = [];

  for (let i = 0; i === 0 || i < array.length - 1; ++i) {
    result.push({
      comparableId: array[i],
      comparatorId: array[i + 1] ?? "",
    })
  }
  
  return result;
};

console.log(transform(array1));
console.log(transform(["124542"]));