I have an array of objects like this one:
{'shapeId': 'shapeid1', 'latlong': '45.42342,-65.23424', 'number': 5}
I want the sum of the values of the attribute "number" when the value of the attribute "shapeId" is the same.
Is there a built in method for that? Thank you!
What I tried so far is this, using reduce() method, but the results are odd when the function is called many times.
function selectMarkersInPoly() {
allTotal = new Array();
alert(allMarkers.length)
for (var i=0; i < createdShapes.length; i++) {
for (var j=0; j < allMarkers.length; j++){
var latlong = allMarkers[j].getPosition();
if(google.maps.geometry.poly.containsLocation(latlong, createdShapes[i]) == true) {
allMarkers[j].setOptions({
icon : "http://labs.google.com/ridefinder/images/mm_20_white.png",
shapeId:createdShapes[i].id
});
}else{
allMarkers[j].setOptions({
icon : "http://labs.google.com/ridefinder/images/mm_20_red.png",
shapeId: 'shapeid0'
});
}
}
}
allTotal = allMarkers.reduce(function(res, obj) {
if (!(obj.shapeId in res)){
res.__array.push(res[obj.shapeId] = obj);
}else {
res[obj.shapeId].number += obj.number;
}
return res;
}, {__array:[]}).__array
.sort(function(a,b) { return b.shapeId - a.shapeId;
});
for (var j=0; j < allTotal.length; j++) {
alert(allTotal[j].shapeId + ': ' + allTotal[j].nbr_electeur)
}
}
//There is 32600 number in total in allMarkers.number in 3505 objects
//first time i call the function, allTotal= [Object { number=32598, shapeId='shapeid0'}, Object { number=2, shapeId='shapeid1'}] where shapeid0 are not selected
//second time i call that function without changing anything, allTotal= [Object { number=65193, shapeId='shapeid0'}, Object { number=2, shapeId='shapeid1'}]
//third time: allTotal= [Object { number=97788, shapeId='shapeid0'}, Object { number=2, shapeId='shapeid1'}]