JavaScript - map, reduce, join

let aggregateElements = (array) => {
    let numbersArray = array.map(Number); // map
    let sum = numbersArray.reduce((a, b) => a + b);

    let inverseValuesSum = numbersArray.reduce((a, b) => a + 1 / b, 0); // reduce
    let stringConcat = numbersArray.join(''); // join
    console.log(sum);
    console.log(inverseValuesSum);
    console.log(stringConcat);
}


aggregateElements([2, 4, 8, 16]);