Get the sum of all specified elements in an array of objects

Question

I have an array of objects as folllows

[
    {\"width\":128.90663423245883,\"height\":160,\"X\":0,\"Y\":140},
    {\"width\":277.0938568683375,\"height\":263,\"X         


        

Answer 1

If you are looking for solution without knowing index of element but you want only to send object, then you will need to check all properties of current item with available items and you can do it like this:

var items = [
{"width":128.90663423245883,"height":160,"X":0,"Y":140},
{"width":277.0938568683375,"height":263,"X":128.90663423245883,"Y":37},
{"width":264.8267031014369,"height":261,"X":277.0938568683375,"Y":39},
{"width":229.14003389179788,"height":60,"X":264.8267031014369,"Y":240},
{"width":10.032771905968888,"height":177,"X":229.14003389179788,"Y":123}
];

function getAllBefore(current) {
    var sum = 0;

    for (var i = 0; i < items.length; i++) {
        var item = items[i];
        if (current.width == item.width && current.height == item.height && current.X == item.X && current.Y == item.Y)
        {
             return sum;
        }

        sum += item.width;
    }
}

getAllBefore(items[2]);