Codecademy - JavaScript Practice: Arrays, Loops, Objects, Iterators

Codecademy_JavascriptChallange.js

/*
Write a function groceries() that takes an array of object literals of grocery items.
The function should return a string with each item separated by a comma except the last two items should be separated by the word 'and'.
Make sure spaces (' ') are inserted where they are appropriate.

groceries( [{item: 'Carrots'}, {item: 'Hummus'}, {item: 'Pesto'}, {item: 'Rigatoni'}] );
// returns 'Carrots, Hummus, Pesto and Rigatoni'
 
groceries( [{item: 'Bread'}, {item: 'Butter'}] );
// returns 'Bread and Butter'
 
groceries( [{item: 'Cheese Balls'}] );
// returns 'Cheese Balls'

*/

// Write function below
const groceries = arr => {
    const len = arr.length;
    if (len == 1)
        return arr[0].item;
    else if (len == 2)
        return arr[0].item + ' and ' + arr[1].item;
    let str = '';
    arr.forEach((obj, indx) => {
        if (indx + 1 == len)
            str += `and ${obj.item}`;
        else if (indx + 2 == len)
            str += `${obj.item} `;
        else
            str += `${obj.item}, `;
    })
    return str;
}

groceries( [{item: 'Carrots'}, {item: 'Hummus'}, {item: 'Pesto'}, {item: 'Rigatoni'}] );
// returns 'Carrots, Hummus, Pesto and Rigatoni'
 
groceries( [{item: 'Bread'}, {item: 'Butter'}] );
// returns 'Bread and Butter'
 
groceries( [{item: 'Cheese Balls'}] );
// returns 'Cheese Balls'