JavaScript: Range of dates

dates.js

Implement and export as default a function that converts input data into a format suitable for plotting.

This function takes three arguments: a data array, the period's start date, and the period's end date. The data is given as an object of the form {value: 14, date: '08/02/2018' }, and the dates format is 'yyyy-MM-dd'.

The date range specifies the output array size that the implemented function should produce. Rules for forming the output array:

• it is filled with entries for each day in the begin - end range
• if there is no day data in the input array, then set the value 0 in the value property of a day entry

import buildRange from './dates.js';

const dates = [
  { value: 14, date: '02.08.2018' },
  { value: 43, date: '03.08.2018' },
];
const beginDate = '2018-08-01';
const endDate = '2018-08-04';

buildRange(dates, beginDate, endDate);
// [
//   { value: 0, date: '01.08.2018' },
//   { value: 14, date: '02.08.2018' },
//   { value: 43, date: '03.08.2018' },
//   { value: 0, date: '04.08.2018' },
// ]

Tips

Documentation on functions for working with dates:

• https://date-fns.org/v2.16.1/docs/eachDayOfInterval
• https://date-fns.org/v2.16.1/docs/format