Tips for sorting through and minimizing data based on the most recent date

info = {
 start: 1,
 data: [
  {
   name: 'Maria',
   date: '2020-02-15
  },
  {
   name: 'Paula',
   date: '2020-06-10
  },
  {
   name: 'Eva',
   date: '2020-12-05
  },
  {
   name: 'Sophia',
   date: '2021-03-21
  }
 ],
 totalRecords: 25
}

I am attempting to filter the information to show only the most recent date, which is 2021-03-21.

This is what I have tried:

response['data']['data'] = response['data']['data'].filter(item => {
           return item['date'] > '2021-03-21';
         });

However, it is not yielding the desired result.

The expected outcome should resemble this

info = {
 start: 1,
 data: [
  {
   name: 'Sophia',
   date: '2021-03-21'
  }
 ],
 totalRecords: 25
}
javascriptarraystypescriptobject

Answer №1

To retrieve the item with the most recent date, you can utilize the sort method followed by selecting the first element in the array.

data.data.sort((a, b) => new Date(b.date) - new Date(a.date))[0];

Answer №2

Various solutions may present certain challenges such as performance issues and unexpected outputs.

  1. Avoid using sort due to the potentially high time complexity of at least O(nlogn).
  2. Using filter could result in retrieving more than one lastItem.

==> Instead, consider utilizing Array#reduce with a time complexity of just O(n), like so:

const comparedDate = new Date('2020-04-01')
const response = {
 start: 1,
 data:[{name:'Juan',date:'2020-01-19'},{name:'Carlo',date:'2020-03-01'},{name:'Dela',date:'2020-03-01'},{name:'Cruz',date:'2021-04-01'}],
 totalRecords:19};

const lastData = response.data.reduce((acc, curr) => {
  if(new Date(curr.date) > comparedDate)
    acc = curr;
  
  return acc;
}, response.data[0]);

console.log(lastData);

If you require multiple items with dates <= 2020-04-01, you can achieve this by:

const comparedDate = new Date('2020-04-01')
const response = {
 start: 1,
 data:[{name:'Juan',date:'2020-01-19'},{name:'Carlo',date:'2020-03-01'},{name:'Dela',date:'2020-03-01'},{name:'Cruz',date:'2021-04-01'}],
 totalRecords:19};

response.data = response.data.reduce((acc, curr) => {
  if(new Date(curr.date) >= comparedDate)
    acc.push(curr);
  
  return acc;
}, []);
console.log(response);

Answer №3

To properly handle the dates in this scenario, it is necessary to transform the date strings into Date objects.

const checkDate = new Date('2020-04-01')
const response = {
 start: 1,
 data: [
  {
   name: 'Juan',
   date: '2020-01-19'
  },
  {
   name: 'Carlo',
   date: '2020-03-01'
  },
  {
   name: 'Dela',
   date: '2020-03-01'
  },
  {
   name: 'Cruz',
   date: '2021-04-01'
  }
 ],
 totalRecords: 19
}

response.data = response
  .data
  .filter(({date}) => new Date(date) > checkDate)
  
console.log(response)

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