Get particular value of array from an object and sum the values

Question

I have the following code:

   if (this.places.length) {
    console.log(this.places);
    var myData = this.places.map(({ points }) => points);
    var myTotal = 0;  // Variable to hold your total

    for(var i = 0, len = myData.length; i < len; i++) {
        myTotal += myData[i][1];  // Iterate over your first array and then grab the second element add the values up
    }
    console.log(myTotal);
  }

I have an object see , from that object i need to extract all arrays, and from that arrays just a particular value, for example points.

The main goal is to sum and save all points into a new variable. The code from abobe it's not working.

would be good if you could put the source data, a sample...

EugenSunic
– EugenSunic

2019-09-01 21:41:52 +00:00
Commented Sep 1, 2019 at 21:41 — EugenSunic
– EugenSunic, Commented Sep 1, 2019 at 21:41

Dacre Denny · Accepted Answer · 2019-09-01 21:49:25Z

5

If I understand correctly, you are wanting to calculate the total of all points fields in each Place object contanied in the this.places array and store the result in a new variable myTotal - one way to achieve that would be via reduce():

if (this.places.length) {

    /* The total returned by reduce() will be stored in myTotal */
    let myTotal = this.places.reduce((total, place) => {    

        /* For each place iterated, access the points field of the 
        current place being iterated and add that to the current
        running total */
        return total + place.points;

    }, 0); /* Total is initally zero */

    console.log(this.places);
    console.log(myTotal);
}

answered Sep 1, 2019 at 21:49

Dacre Denny

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Comments

Addis · Accepted Answer · 2019-09-01 22:13:19Z

0

Another option could be to use the forEach on the places array and add the value of the points property:

   if (this.places.length) {
    var myTotal = 0;  // Variable to hold your total

    places.forEach(place => myTotal = myTotal + place.points);
    console.log(myTotal);
  }

edited Sep 1, 2019 at 22:13

answered Sep 1, 2019 at 22:03

Addis

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