30-seconds-of-code/snippets/average.md

average

Returns the average of an of two or more numbers/arrays.

Use Array.reduce() to add each value to an accumulator, initialized with a value of 0, divide by the length of the array.

const average = (...arr) => [].concat(...arr).reduce((acc, val) => acc + val, 0) / arr.length;

average([1, 2, 3]); // 2