#5 - Root mean square

[thomasfoster]

The description of root mean square may be lacking. Let me know if anything needs updating. Thanks!

[boristane]

Can you please rename the method to rms as set in #5 ?

[boristane]

Please rename to rms throughout all files.

[boristane]

I understand what you are checking here but it is a bit counter-intuitive. It is not necessary to compute the min of the array when calculating its rms. Could you please use this check instead ?

if (!Array.isArray(arr) || arr.length === 0) return undefined;

[boristane]

Although this approach solves the problem, it does not make use of previously defined methods in the library. We could use the literal definition of the rms:

• Compute the mean of the squared values of the elements of the array;
• Compute its square root if it exists.

This would give something like this:

function rms(arr) {
  const xBar = mean(arr.map(elt => elt ** 2));
  return xBar === undefined ? undefined : Math.sqrt(xBar);
}