Average with Rest Params

A rest parameter gathers many arguments into an array. Type the rest parameter as number[] and return a number. Decide what to return when there are no inputs.

Keep the function pure and the code short.

function sum(...xs: number[]) {
  return xs.reduce((a, b) => a + b, 0);
}

Your Task

Compute the average of any number of inputs.

Implement average(...nums: number[]): number.
Return 0 when no numbers are provided.
Avoid mutation.