Question about changing the array value before sorting the array

Question

I'm developing the React Web App.

Users will have their array after entering on a certain page.

The array looks like this:

After getting an array, I want to resort the array by one of the values of startedDate

Here is my code :

 sortedCard.forEach( item => {
      if(item.startedDate === null || item.expiredDate === null){
        item.startedDate = '9999'
      }else if(item.startedDate !== null){
        item.startedDate = item.startedDate.split('-')[1]+item.startedDate.split('-')[2]
      }
    } )

I tried map, don't work! And change the current array to the hard coded one(the current array is fetch from server and passed by Redux), it works!

Answer 1

After getting an array, I want to resort the array by one of the values of startedDate

You can sort an array of objects using the sort() function:

 const objs = [ { id: 1, startedDate: '2019-05-01' }, { id: 2, startedDate: '2019-05-03' }, { id: 3, startedDate: '2019-04-10' }, { id: 4, startedDate: '2019-01-21' }, ] objs.sort((a, b) => (a.startedDate > b.startedDate) ? 1 : ((b.startedDate > a.startedDate) ? -1 : 0)) console.log(objs) 

This code loops over each object in the array, grabs the property value startedDate , then compares it against each other startedDate for each other object in the array and rearranges them accordingly.