Cumulative moving average
npm install cumulative-moving-average``js
var cma = require('cumulative-moving-average')
var avg = cma()
avg.push(1)
console.log(avg.value) // 1
console.log(avg.length) // 1
avg.push(3)
console.log(avg.value) // 2
console.log(avg.length) // 2
``