1.5 KiB
1.5 KiB
title | id | challengeType |
---|---|---|
Averages-Root mean square | 594da033de4190850b893874 | 5 |
Description
Instructions
Tests
tests:
- text: <code>rms</code> is a function.
testString: assert(typeof rms === 'function', '<code>rms</code> is a function.');
- text: <code>rms([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])</code> should equal <code>6.2048368229954285</code>.
testString: assert.equal(rms(arr1), answer1, '<code>rms([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])</code> should equal <code>6.2048368229954285</code>.');
Challenge Seed
function rms(arr) {
// Good luck!
}
After Test
const arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
const answer1 = 6.2048368229954285;
Solution
function rms(arr) {
const sumOfSquares = arr.reduce((s, x) => s + x * x, 0);
return Math.sqrt(sumOfSquares / arr.length);
}