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Realtime moving average of an array of numbers in JavaScript
Problem
We are required to write a JavaScript function that takes in an array. Our function should construct a new array that stores the moving average of the elements of the input array. For instance −
[1, 2, 3, 4, 5] → [1, 1.5, 3, 5, 7.5]
First element is the average of the first element, the second element is the average of the first 2 elements, the third is the average of the first 3 elements and so on.
Example
Following is the code −
const arr = [1, 2, 3, 4, 5];
const movingAverage = (arr = []) => {
const res = [];
let sum = 0;
let count = 0;
for(let i = 0; i < arr.length; i++){
const el = arr[i];
sum += el;
count++;
const curr = sum / count;
res[i] = curr;
};
return res;
};
console.log(movingAverage(arr));Output
Following is the console output −
[ 1, 1.5, 2, 2.5, 3 ]
Updated on: 20-Apr-2021
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