curriculum/challenges/english/blocks/learn-advanced-array-methods-by-building-a-statistics-calculator/6352ebd3ab962c168a122e85.md
Now you need to find the value that occurs with the highest frequency. You'll use the Object.keys() method for this.
Start by declaring a highest variable, and assigning it the value of the counts object's Object.keys() method.
Your getMode function should have a highest variable.
assert.match(getMode.toString(), /highest\s*=/);
Your getMode function should use the Object.keys() method to get the keys of the counts object.
assert.match(getMode.toString(), /Object\.keys\(\s*counts\s*\)/);
Your getMode function should use the Object.keys() method to get the keys of the counts object and assign them to the highest variable.
assert.match(getMode.toString(), /highest\s*=\s*Object\.keys\(\s*counts\s*\)/);
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" href="./styles.css" />
<script src="./script.js"></script>
<title>Statistics Calculator</title>
</head>
<body>
<h1>Statistics Calculator</h1>
<p>Enter a list of comma-separated numbers.</p>
<form onsubmit="calculate(); return false;">
<label for="numbers">Numbers:</label>
<input type="text" name="numbers" id="numbers" />
<button type="submit">Calculate</button>
</form>
<div class="results">
<p>
The <dfn>mean</dfn> of a list of numbers is the average, calculated by
taking the sum of all numbers and dividing that by the count of numbers.
</p>
<p class="bold">Mean: <span id="mean"></span></p>
<p>
The <dfn>median</dfn> of a list of numbers is the number that appears in
the middle of the list, when sorted from least to greatest.
</p>
<p class="bold">Median: <span id="median"></span></p>
<p>
The <dfn>mode</dfn> of a list of numbers is the number that appears most
often in the list.
</p>
<p class="bold">Mode: <span id="mode"></span></p>
<p>
The <dfn>range</dfn> of a list of numbers is the difference between the
largest and smallest numbers in the list.
</p>
<p class="bold">Range: <span id="range"></span></p>
<p>
The <dfn>variance</dfn> of a list of numbers measures how far the values
are from the mean, on average.
</p>
<p class="bold">Variance: <span id="variance"></span></p>
<p>
The <dfn>standard deviation</dfn> of a list of numbers is the square
root of the variance.
</p>
<p class="bold">
Standard Deviation: <span id="standardDeviation"></span>
</p>
</div>
</body>
</html>
body {
margin: 0;
background-color: rgb(27, 27, 50);
text-align: center;
color: #fff;
}
button {
cursor: pointer;
background-color: rgb(59, 59, 79);
border: 3px solid white;
color: white;
}
input {
background-color: rgb(10, 10, 35);
color: white;
border: 1px solid rgb(59, 59, 79);
}
.bold {
font-weight: bold;
}
const getMean = (array) => array.reduce((acc, el) => acc + el, 0) / array.length;
const getMedian = (array) => {
const sorted = array.toSorted((a, b) => a - b);
const median =
sorted.length % 2 === 0
? getMean([sorted[sorted.length / 2], sorted[sorted.length / 2 - 1]])
: sorted[Math.floor(sorted.length / 2)];
return median;
}
--fcc-editable-region--
const getMode = (array) => {
const counts = {};
array.forEach(el => counts[el] = counts[el] ? counts[el] + 1 : 1);
if (new Set(Object.values(counts)).size === 1) {
return null;
}
}
--fcc-editable-region--
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);
document.querySelector("#mean").textContent = mean;
document.querySelector("#median").textContent = median;
}