Remove duplicate element pairs from multidimensional array

Question

I have an array that looks like this:

1.  coordinates = [ [16.343345, 35.123523],
2.                  [14.325423, 34.632723],
3.                  [15.231512,         


        

Answer 1

function sortCoordinates(arr){
    var obj = {};
    for(var i = 0, l = arr.length; i < l; i++){
        var el = arr[i];
        var lat = el[0];
        var lng = el[1];

        if(!obj[lat + lng]){
            obj[lat + lng] = [lat, lng];
        } 
    }

    var out = [];
    for(p in obj){
        out.push([obj[p][0], obj[p][1]]);
    }
    return out;
}