#2: I need to create a new array from a given one and transform all the elements

for_map.js

// Given the array of prices, return a new array with the prices n % lower.
const discount = (originalPrices, discountAmount) => {
    const multiplier = 1 - discountAmount;
    // we must clone the array
    let result = new Array(originalPrices);
    for (let i = 0; i < originalPrices.length; i++) {
        result[i] = originalPrices[i] * multiplier;
    }
    return result;
}

const prices = [5, 25, 8, 18];
console.log(discount(prices, 0.2)); //logs [ 4, 20, 6.4, 14.4 ]

const discount = (originalPrices, discountAmount) => {
    const multiplier = 1 - discountAmount;
    return originalPrices.map(price => price * multiplier);
}

const prices = [5, 25, 8, 18];
console.log(discount(prices, 0.2)); // logs [ 4, 20, 6.4, 14.4 ]