How to detect if argument is array instead of object with Node.js?

To detect if argument is array instead of object with Node.js, we call the util.isArray method.

For instance, we write

const util = require("util");

const isArray = util.isArray([]);
const isArray2 = util.isArray(Array(55));

to call isArray with the value we want to check if it’s an array.

isArray should return true for both since both arguments are arrays.