How to filter last day in an array?

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I have an array of objects like this:

[
    {
        created: "2019-08-14T13:24:36Z",
        email: "test1@gmail.com"
    },
    {
        created: "2019-08-15T13:24:36Z",
        email: "test2@gmail.com"
    },
    {
        created: "2019-08-16T13:24:36Z",
        email: "test1@gmail.com"
    },
    {
        created: "2019-08-22T13:24:36Z",
        email: "test4@gmail.com"
    },
    {
        created: "2019-08-22T15:29:66Z",
        email: "test1@gmail.com"
    }
]

The array is sorted by created. I want to filter those records which are on the last day, irrespective of the time on that day. I added the timestamp using moment.js. Something on these lines:

router.get('/GetLastDayRecords', (req, res) => {
    res.json(allRecords.filter(record => record.created.max()));
});

Split the task: first get the maximum date which you'll find at the end of the sorted array (just getting the "YYYY-MM-DD" part of it is enough) and then launch the filter:

let max = allRecords.length ? allRecords[allRecords.length-1].created.slice(0,10) : "";
res.json(allRecords.filter(({created}) => created >= max));

Find last day in a month in excel and delete all other rows, It is an array formula so it needs to be confirmed with Ctrl-Shift-Enter instead of OR this non CSE array formula: Then filter on all the FALSE and Delete. For these filters we set the Operator parameter to xlFilterValues. We use Criteria2 (not Criteria1) to specify an Array of items using the Array function. This is a special patterned array where the first number is the time period (year, months, days, etc.). The second number is the last date in the range.

First you need to figure out which day is the last day. If you can assume the records are already sorted, then this is pretty simple:

// Assuming your records are stored in the variable "records"

var lastDay = records[records.length - 1].created;

Now here's where your specific answer may differ based on how you want to handle time zones. Suppose one event happened at 11 PM EST (3 AM GMT) and another event happened at 1 AM EST (5 AM GMT). Are these the same day? In Europe they are, but in America they aren't!

What you need to do is create some cipher from the date+time listed to a "day". This way you can compare two "days" to see if they're the same:

lastDay = new Date(lastDay);
// Setting hours, minutes, and seconds to 0 will give you just the "day" without the time, but by default will use the system timezone
lastDay.setHours(0);
lastDay.setMinutes(0);
lastDay.setSeconds(0);

Once you know which day was the last, it's a simple filter:

// Using a for loop
var results = []
for (var i = 0; i < records.length; i++)
{
    if (records[i].created > lastDay) {
        results.push(records[i]);
    }
}

// Using .filter
var results = records.filter(x => x.created > lastDay);

Alternatively, since we know it's already sorted, we can do it a bit more efficiently by binary searching for the first record on the last day, then grabbing all records after that:

var test = records.length / 2;
var step = records.length / 4;
var found = false;
while (!found) {
    if (records[test].created < lastDay) {
        test += step;
        step /= 2;
    }
    else if (records[test].created > lastDay) {
        if (step == 1) {
            // We found the exact cut-off
            found = true;
        }
        else {
            test -= step;
            step /= 2;
        }
    }
}

var results = records.slice(test);

Because you're only interested in the "last" day, the logic is a bit simpler. If you wanted the "third" day, you would need to check if created was after the start of the third day and before the end of the third day. We can just check if it's after the start of the last day.

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I wrote a solution using reduce and filter:

const lastDay = arr.reduce((acc, el) => {
    const date = el.created.substr(0,10);
    const oldDate = new Date(acc);
    const nextDate = new Date(date);
    if(oldDate.getTime() > nextDate.getTime()) {
        return oldDate;
    } else {
        return nextDate;
    }
}, '1900-01-01');

const lastDayArr = arr.filter(el => {
    const date = el.created.substr(0,10);
    const oldDate = new Date(lastDay);
    const nextDate = new Date(date);
    return (oldDate.getTime() === nextDate.getTime());
});

First, you find the most recent date, reducing the original array by comparing which date is the most recent, for this you drop the part of the created string that specifies the hours/minutes/seconds. You can use a very distant in time date as initial value, or you can set it to null and add another validation in your callback function.

As a second step, you use filter, using the same technique of dropping the hours/minutes/seconds of the created string.

The end result is an array of the elements with the most recent date in your original array.

If you can assume the array is sorted, you can skip the reduce method and just do:

const lastDay = arr[arr.length - 1].created.substr(0,10);

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This should work:

allRecords.filter( record => {
    let last_date = allRecords[ allRecords.length - 1].created
    return last_date.slice(0, 10) === record.created.slice(0, 10)
})

Basically, you are getting the last element from your array and slicing its created value down to its date. Then you are slicing your current record's created value down to its date and comparing if they are the same.

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Comments
  • What have you tried so far to solve it on your own?
  • @Andreas I tried to do this but could not figure it out properly.
  • The array is already sorted. Just grab the last element and iterate over the array to find the elements that should be kept/removed (Array.prototype.filter()).
  • This is a great answer! I didn't know you could compare date strings like that, with plain comparison operators (created >= max). I had to double check it myself and it works! Brilliant stuff. Thanks.
  • @selmanbey That's no "magic" date string comparison. And it only works because of the yyyy-mm-dd format.
  • It's not the most succinct solution, but I think it's the easiest to read and reason about for other programmers