How to split each element of an array of strings into different categories using Node.js?

function split_array(array, categories, split_size) {
    // Initialize empty array
    const chunks = [];

    // Initialize index equal to zero to keep track of categories
    const index = 0;

    // Traverse the array according to the split size
    for (let i = 0; i < array.length; i += split_size) {
        // Slicing the split_size array from i
        let temp = array.slice(i, i + split_size);

        // Assigning the sliced array to the category
        chunks[categories[index]] = temp;

        // Increment index to keep track of categories
        index++;
    }

    // return the final array
    return chunks;
}
//input array
const input = ['abc', 'def', 'ghi', 'jkl', 'mno', 'pqr', 'stw', 'xyz']
//categories array
const categories = ['a', 'b', 'c']
const split_size = 3; //split size

//calling the function
const output = split_array(input, categories, split_size);
console.log(output) //printing the array