CODEWITHSUNDEEP
javascriptarrays
asertym
asertym

Reputation: 120

Create a single array from returned strings

I have a for loop that goes through all elements of a certain class and returns the value (which in my case it's a date — e.g. 2020-05-15) and splits it. So I get multiple arrays from which I want to create one joined array of all years without duplicates.

My code is basic right now, but I'm constantly running into troubles.

function getDate () {
        for (var i = 0; i < total; i++) {
            var dateSplit = elements.date[i].innerText.split('-'); 
            // this returns multiple arrays of {'year', 'month', 'day'}
            var dateOnly = dateSplit[0] // returns multiple strings of years
        }
}

How do i join dateOnly into one array?

Upvotes: 1

Views: 68

Answers (2)

Jobelle
Jobelle

Reputation: 2834

Try the below

function getYearAsArray(p1, p2) {
  var temp = ['2025-05-15', '2092-05-15', '2021-05-15', '2021-05-15'];
  
 var result =  temp.map(i=> {
  return i.replace(/^(\d{4})(-\d{2}-\d{2})$/, '$1');
  });
 
  return [...new Set(result)];;
}

Check this

Upvotes: 0

Nina Scholz
Nina Scholz

Reputation: 386600

You could collect the years in a Set and return an array of unique values.

function getDate() {
    const years = new Set;
    for (var i = 0; i < total; i++) {
        years.add(+elements.date[i].innerText.split('-', 1)[0]);
    }
    return [...years];
}

Upvotes: 3

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