average

Returns the average of two or more numbers.

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

typescript

const average = <T extends number>(...nums: number[]) =>
  nums.reduce((acc, val) => acc + val, 0) / nums.length;

typescript

average(...[1, 2, 3, 4]); // 2.5
average(1, 2, 3); // 2