I have a problem getting the second highest date in ES6. I’m using moment.js
too.
Its supposed to be getting the id
of 3.
const datas = [ { id: 1, date: moment(String('Apple & Banana - 20072021').match(/[0-9]/g).join(""), 'DDMMYYYY').toDate() }, { id: 2, date: moment(String('Apple & Oranges - 30082021').match(/[0-9]/g).join(""), 'DDMMYYYY').toDate() }, { id: 3, date: moment(String('Lemon & Oranges - 30102021').match(/[0-9]/g).join(""), 'DDMMYYYY').toDate() }, { id: 4, date: moment(String('Honeydew - 30112021').match(/[0-9]/g).join(""), 'DDMMYYYY').toDate() } ]; const secondLatestDate = new Date(datas.map(file => new Date(file.date)).sort().reverse()[1]); const finalResult = datas.find(file => file.date.getTime() === secondLatestDate.getTime()); console.log(finalResult)
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>
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Answer
You should use custom sort function as:
datas.sort((a, b) => a.date - b.date)
There is no need to use find
when you are reverse
ing the array and getting the index 1
from it.
Note: I deliberately change the order of the datas array
const datas = [{ id: 1, date: moment(String('Apple & Banana - 20072021').match(/[0-9]/g).join(""), 'DDMMYYYY').toDate() }, { id: 2, date: moment(String('Apple & Oranges - 30082021').match(/[0-9]/g).join(""), 'DDMMYYYY').toDate() }, { id: 4, date: moment(String('Honeydew - 30112021').match(/[0-9]/g).join(""), 'DDMMYYYY').toDate() }, { id: 3, date: moment(String('Lemon & Oranges - 30102021').match(/[0-9]/g).join(""), 'DDMMYYYY').toDate() } ]; const secondLatestDate = datas.sort((a, b) => a.date - b.date).reverse()[1]; console.log(secondLatestDate);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>
or you can directly find the second largest after sort. There is no need to reverse
the array
datas.sort((a, b) => a.date - b.date)[datas.length - 2]
const datas = [{ id: 1, date: moment( String('Apple & Banana - 20072021').match(/[0-9]/g).join(''), 'DDMMYYYY' ).toDate(), }, { id: 2, date: moment( String('Apple & Oranges - 30082021').match(/[0-9]/g).join(''), 'DDMMYYYY' ).toDate(), }, { id: 4, date: moment( String('Honeydew - 30112021').match(/[0-9]/g).join(''), 'DDMMYYYY' ).toDate(), }, { id: 3, date: moment( String('Lemon & Oranges - 30102021').match(/[0-9]/g).join(''), 'DDMMYYYY' ).toDate(), }, ]; const secondLatestDate = datas.sort((a, b) => a.date - b.date)[datas.length - 2]; console.log(secondLatestDate);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>