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Maximum average of a specific length of subarray in JavaScript
Problem
We are required to write a JavaScript function that takes in an array of integers, arr, as the first argument and a number, num, as the second argument.
Our function should find the contiguous subarray of given length num that has the maximum average value. And we need to output the maximum average value.
For example, if the input to the function is
Input
const arr = [1, 12, -5, -6, 50, 3]; const num = 4;
Output
const output = 12.75;
Output Explanation
Because the desired subarray is [12, -5, -6, 50]
Example
Following is the code −
const arr = [1, 12, -5, -6, 50, 3];
const num = 4;
const maxAverage = (arr = [], num) => {
let sum = arr.slice(0, num).reduce((acc, v) => acc + v, 0)
let max = sum
for (let i = 1; i <= arr.length - num; i++) {
sum = sum + arr[i + num - 1] - arr[i - 1]
max = Math.max(max, sum)
}
return max / num
}
console.log(maxAverage(arr, num));Output
12.75
Updated on: 24-Apr-2021
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