CODEWITHSUNDEEP
javascriptarraysdatejavascript-objects
Karam
Karam

Reputation: 336

insert object into array based on dates oldest to newest

I an array of objects. Each object has a date property and a string property. I also have an empty array. I cant figure out the logic to push the string based on date oldest to newest . 

     const oldToNew = []
     for (const baseId in results[key][test]) {
            // log the array of objects
            //example [{string: 'test', date: '2019-03-04T10:36:37.206000Z'}, {string: 'test1', date: '2019-03-010T10:36:37.206000Z'}]
            console.log(results[key][test][baseId])
            results[key][test][baseId].forEach(element => {

            });
        }
     // I want the value to be [test, test1]

Upvotes: 0

Views: 1091

Answers (2)

Francis Leigh
Francis Leigh

Reputation: 1960

Use Array.sort to compare the date property of each Object against the one before it - then use Array.map to return an Array of all the items 'string properties.

Update no need to parse the date timestamp.

const items = [{string: 'test4', date: '2019-03-04T10:36:37.206000Z'}, {string: 'test1', date: '2019-03-10T10:36:37.206000Z'}, {string: 'test2', date: '2019-03-09T10:36:37.206000Z'}, {string: 'test3', date: '2019-03-07T10:36:37.206000Z'}]

const strings = items
  .sort((a, b) => b.date > a.date)
  .map(({ string }) => string)

console.log(strings)

Upvotes: 1

606ep
606ep

Reputation: 156

You need to sort initial array with sort and then extract strings with map

something like this:

array.sort((a, b) => a.date < b.date).map(el => el.string);

Upvotes: 1

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