How can dates be grouped by week and the cumulative total be calculated through nodeJS?

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There are multiple ways to achieve this in NodeJS. One approach could be:

1. Get the list of dates for which cumulative total needs to be calculated
2. Group dates by week using the moment library
3. Calculate cumulative total for each week
4. Store the cumulative total for each week in an object or an array

Here's an example code snippet:

const moment = require('moment');

// assuming we have an array of dates in YYYY-MM-DD format
const dates = ['2022-01-01', '2022-01-02', '2022-01-03', '2022-01-08', '2022-01-09'];

// create an object to store cumulative total for each week
const weeklyTotal = {};

// iterate through the dates
dates.forEach(date => {
  const week = moment(date).isoWeek(); // get the week number using moment library
  if (!(week in weeklyTotal)) {
    weeklyTotal[week] = 0; // initialize the week's cumulative total to 0
  }
  weeklyTotal[week] += 1; // add 1 to the week's cumulative total for each date
});

console.log(weeklyTotal); // output the cumulative total for each week

This example code calculates cumulative total by counting the number of dates in each week. Depending on the specific use case, the calculation for cumulative total may need to be adjusted.