Product of numeric values

Calculates the product of two or more numbers/arrays.

• Use Array.prototype.reduce() to multiply each value with an accumulator, initialized with a value of 1.

const prod = (...arr) => [...arr].reduce((acc, val) => acc * val, 1);

prod(1, 2, 3, 4); // 24
prod(...[1, 2, 3, 4]); // 24