JSON array of objects with properties and group it

JavaScript
1

For now, here is the code

const data = [ { "from":"03/01/2021", "to":"03/06/2021" }, { "from":"03/10/2021", "to":"03/15/2021" }, { "from":"03/20/2021", "to":"03/25/2021" } ]

const monthToString = month => {
  const months = {
    '01': 'Jan',
    '02': 'Feb',
    '03': 'Mar',
    '04': 'Apr',
    '05': 'May',
    '06': 'Jun',
    '07': 'Jul',
    '08': 'Aug',
    '09': 'Sep',
    '10': 'Oct',
    '11': 'Nov',
    '12': 'Dec',
    
  }
  return months[month] || month
}


const result = Object.entries(data.reduce((res, {from, to}) => {
  const [monthFrom, day, year] = from.split('/')
  const [m, dayTo, y] = to.split('/')
  
  const month = monthToString(m)
  
  return {
   ...res,
   [month]: [...(res[month] || []), [day, dayTo]]
  }
  
}, {})).map(([month, days]) => `${month} ${days.map(([from, to]) => `${parseInt(from)}-${parseInt(to)}`).join(', ')}`).join('\n')

console.log(result)

Can some help? Learning JS…little bit hard for me(

2

What do you have done so far? At which point exactly are you stuck?

4 
const data = [ { "from":"03/01/2021", "to":"03/06/2021" }, { "from":"03/10/2021", "to":"03/15/2021" }, { "from":"03/20/2021", "to":"03/25/2021" } ]

const monthToString = month => {
  const months = {
    '01': 'Jan',
    '02': 'Feb',
    '03': 'Mar',
    '04': 'Apr',
    '05': 'May',
    '06': 'Jun',
    '07': 'Jul',
    '08': 'Aug',
    '09': 'Sep',
    '10': 'Oct',
    '11': 'Nov',
    '12': 'Dec',
    
  }
  return months[month] || month
}


const result = Object.entries(data.reduce((res, {from, to}) => {
  const [monthFrom, day, year] = from.split('/')
  const [m, dayTo, y] = to.split('/')
  
  const month = monthToString(m)
  
  return {
   ...res,
   [month]: [...(res[month] || []), [day, dayTo]]
  }
  
}, {})).map(([month, days]) => `${month} ${days.map(([from, to]) => `${parseInt(from)}-${parseInt(to)}`).join(', ')}`).join('\n')

console.log(result)

I dont know How to Combine dates when they intersect?

5

How would you do that by hand?

6

It is possible to compare the date “from” the first array with the second one, if it is greater than or equal to, we proceed to the comparison “to”

7

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