Generate an array with random data without using a for loop

Create an array with blanks, and then use .map() to create users:

const createUsers = (numUsers = 5) => {
    return Array(numUsers)
        .fill(null)
        .map(createUser);
}

Array.from allows you to create an array and initialize it with values returned from a callback function in one step:

const createUsers = (numUsers = 5) => {
    return Array.from({length: numUsers}, createUser);
}