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How to compute the sum and average of elements in an array with JavaScript?

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To compute the sum and average of elements in an array with JavaScript, we use the reduce method.

For instance, we write

const average = (arr) => arr.reduce((p, c) => p + c, 0) / arr.length;
const result = average([4, 4, 5, 6, 6]);
console.log(result);

to define the average function that calls arr.reduce to return the sum of the entries in arr.

And we divide the sum by arr.length array length to get the average.

Then we call average to return the average of the entries in [4, 4, 5, 6, 6].

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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