Learn Advanced Array Methods by Building a Statistics Calculator - Step 46

JavaScript
1

###i am trying to use the Math.pow() function to assign standard deviation the value of variance1/2

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Challenge Information:

Learn Advanced Array Methods by Building a Statistics Calculator - Step 46

2

It looks like your code was too long to be ported over automatically, so you’ll need to edit your post and paste your full code between two sets of triple backticks so that it displays correctly on the forum.

3

###i am trying to use the Math.pow() function to assign standard deviation the value of variance1/2

Your code so far

WARNING

The challenge seed code and/or your solution exceeded the maximum length we can port over from the challenge.

You will need to take an additional step here so the code you wrote presents in an easy to read format.

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const getMean = (array) => array.reduce((acc, el) => acc + el, 0) / array.length;

const getMedian = (array) => {
  const sorted = array.sort((a, b) => a - b);
  const median =
    array.length % 2 === 0
      ? getMean([sorted[array.length / 2], sorted[array.length / 2 - 1]])
      : sorted[Math.floor(array.length / 2)];
  return median;
}

const getMode = (array) => {
  const counts = {};
  array.forEach((el) => {
    counts[el] = (counts[el] || 0) + 1;
  })
  if (new Set(Object.values(counts)).size === 1) {
    return null;
  }
  const highest = Object.keys(counts).sort(
    (a, b) => counts[b] - counts[a]
  )[0];
  const mode = Object.keys(counts).filter(
    (el) => counts[el] === counts[highest]
  );
  return mode.join(", ");
}

const getRange = (array) => {
  return Math.max(...array) - Math.min(...array);
}

const getVariance = (array) => {
  const mean = getMean(array);
  const variance = array.reduce((acc, el) => {
    const difference = el - mean;
    const squared = difference ** 2;
    return acc + squared;
  }, 0) / array.length;
  return variance;



}

const getStandardDeviation = (array) => {
  const variance = getVariance(array);
  const standardDeviation = Math.pow()
}



const calculate = () => {
  const value = document.querySelector("#numbers").value;
  const array = value.split(/,\s*/g);
  const numbers = array.map(el => Number(el)).filter(el => !isNaN(el));
  
  const mean = getMean(numbers);
  const median = getMedian(numbers);
  const mode = getMode(numbers);
  const range = getRange(numbers);
  const variance = getStandardDeviation(numbers);

  document.querySelector("#mean").textContent = mean;
  document.querySelector("#median").textContent = median;
  document.querySelector("#mode").textContent = mode;
  document.querySelector("#range").textContent = range;
  document.querySelector("#variance").textContent = variance;
}

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Challenge Information:

Learn Advanced Array Methods by Building a Statistics Calculator - Step 46

4

This is correct so far but you need to include the specified values within the method’s parentheses.

Here’s more info on Math.pow()

5

including the specified value is where i am having issues… i am trying to enter the variance1/2 as i am instructed but having difficulties doing that

6

As the Math.pow() documentation (linked above) explains, you supply two (comma-separated) values to the method, inside the parentheses.
The first is the base number (in this case variance) and the second is the power (in this case 1/2).

7

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