anestin

var polygon={
    area: function(points){
        var sum=0, n=points.length;

        if(points[0][0] != points[n-1][0] || points[0][1] != points[n-1][1]){
            sum += (points[n-1][0]*points[0][1] - points[0][0]*points[n-1][1]);
        }

        for(var i=0; i < n-1; ++i){
            sum += (points[i][0]*points[i+1][1] - points[i+1][0]*points[i][1]);

anestin

Candle

Watch interactive video on Scrimba: https://scrimba.com/p/pEgDAM/cBEvpTL

A Pen by anestin on CodePen.

License.