One-liner to find the average of an array of numbers in JavaScript

Here’s the one-liner to find the average of an array of numbers in Javascript:

const average = (arr) => arr.reduce((a, b) => a + b, 0) / arr.length;

This uses the reduce() method to sum up all the elements in the array, and then divides that sum by the length of the array to get the average. The => syntax is part of ES6 arrow function notation, which allows for concise function definitions.

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