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Product of numeric values
JavaScript, Math, Array · Oct 22, 2020
Calculates the product of two or more numbers/arrays.
- Use
Array.prototype.reduce()to multiply each value with an accumulator, initialized with a value of1.
const prod = (...arr) => [...arr].reduce((acc, val) => acc * val, 1);prod(1, 2, 3, 4); // 24
prod(...[1, 2, 3, 4]); // 24More like this
Cartesian product
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Calculates the cartesian product of two arrays.
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Calculates the average of an array, after mapping each element to a value using the provided function.