CODEWITHSUNDEEP
javascript
Phil Lachmann
Phil Lachmann

Reputation: 231

Eliminate array entries based on date

I have an array of data similar to this:

var items  = [
  { id: 84, "completedDate":"2019-01-26T17:45:07.895Z" },
  { id: 92, "completedDate":"2019-02-26T17:45:07.895Z" }, 
  { id: 123, "completedDate":"2019-03-26T17:45:07.895Z" }, 
  { id: 2353, "completedDate":"2019-04-26T17:45:07.895Z" }
];

I would like to return an array with only objects less than 30 days old.

I have tried to filter

var filtered = items.filter(function(item) { 
  return moment(item.completedDate) > moment.subtract(30, 'days');  
});

Is this what I need to do, or is there a better way to do this?

Upvotes: 1

Views: 62

Answers (3)

Kamil Kiełczewski
Kamil Kiełczewski

Reputation: 92367

try

items.filter( x=> x.completedDate > today.toISOString() );


var items  = [
  { id: 84, "completedDate":"2019-01-26T17:45:07.895Z" },
  { id: 92, "completedDate":"2019-02-26T17:45:07.895Z" }, 
  { id: 123, "completedDate":"2019-03-26T17:45:07.895Z" }, 
  { id: 2353, "completedDate":"2019-04-26T17:45:07.895Z" }
];

var today = new Date("2019-04-20T17:45:07.895Z") // or: new Date() 
today = new Date(+today - 30 *86400000)

let r= items.filter( x=> x.completedDate > today.toISOString() );

console.log(r);

Upvotes: 0

Chris Barr
Chris Barr

Reputation: 33972

Here's a similar way to do this without moment. here we just get the current day, reset the time back to the start of the day (you may or may not need this for your use case) and then we just use plain JS date objects to compare

var items  = [
  { id: 84, "completedDate":"2019-01-26T17:45:07.895Z" },
  { id: 92, "completedDate":"2019-02-26T17:45:07.895Z" }, 
  { id: 123, "completedDate":"2019-03-26T17:45:07.895Z" }, 
  { id: 2353, "completedDate":"2019-04-26T17:45:07.895Z" }
];

var thirtyDaysAgo = new Date();
thirtyDaysAgo.setHours(0, 0, 0, 0);
thirtyDaysAgo.setDate(thirtyDaysAgo.getDate() - 30);

var filtered = items.filter(function(item) { 
  var d = new Date(item.completedDate).getTime();
  return d > thirtyDaysAgo;  
});

console.log(filtered);

Or, an even smaller filter function (if you don't need IE 11 support) would be:

var filtered = items.filter((item) => new Date(item.completedDate).getTime() > thirtyDaysAgo);

Upvotes: 1

Maximilian Burszley
Maximilian Burszley

Reputation: 19654

You don't need moment to compare dates:

const compareDate = new Date();
compareDate.setDate(compareDate.getDate() - 30);

const filtered = items.filter(item => new Date(item.completedDate) > compareDate);

Upvotes: 1

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