Александр

const pow = (number, power) => {
    if (number === 1 || power === 0) {
        return 1;
    }

    const count = Math.round(Math.abs(power));
    let result = number;
    for (let index = 0; index < count - 1; index++) {
        result *= number;
    }

    if (power < 0) {
        return 1 / result;
    } else {
        return result;
    }
};

console.log(Math.pow(2, 2) === pow(2, 2)); // true
console.log(Math.pow(2, -2) === pow(2, -2)); // true
console.log(Math.pow(2, -3) === pow(2, -3)); // true
console.log(Math.pow(3, -4) === pow(3, -4)); // true

function mynumber(a, b) {
	var c = 1;
	if (b < 0) {
		for (var i = b; i < 0; i++) {
			c /= a;
		}
	} else {
		for (var i = 1; i <= b; i++) {
			c *= a;
		}
	}
	return c;
}

const total = array.reduce((acc, entry) => {
	acc += entry.price;
	return acc;
}, 0);

color : 'rgba(' + '255, 255, 255' + ',' + 0.4 + ')'