task1.js

const ITEMS_MAX = 3000000;
const calcPercent = (items) => {
    if (items.length > 3000000) {
        return null;
    }

    const digits = items.map(i => Number(i));
    const sum = digits.reduce((a, item) => a + item, 0);
    
    return digits.map(i => (100/(sum/i)).toFixed(3));
};

console.log('calcPercent params:', ['1.5', '3', '6', '1.5']);
console.log('calcPercent result:', calcPercent(['1.5', '3', '6', '1.5']));


console.log('calcPercent params:', ['23.56', '63.47', '96.12', '0.15', '40.22', '80.44']);
console.log('calcPercent result:', calcPercent(['23.56', '63.47', '96.12', '0.15', '40.22', '80.44']));

const simple = [...Array(3000000).keys()];
console.log('calcPercent result:', calcPercent(simple));