Summarize array of objects and calculate average value for each unique object name

Question

I have an array like so:

var array = [
     {
       name: \"a\",
       value: 1 
     },
     {
       name: \"a\",
       value: 2 
     },
     {
                


        

Answer 1

var array = [
     {
       name: "a",
       value: 1 
     },
     {
       name: "a",
       value: 2 
     },
     {
       name: "a",
       value: 3 
     },
     {
       name: "b",
       value: 0 
     },
     {
       name: "b",
       value: 1 
     }
 ];
var sum = {};
for(var i = 0; i < array.length; i++) {
    var ele = array[i];
    if (!sum[ele.name]) {
        sum[ele.name] = {};
        sum[ele.name]["sum"] = 0;
        sum[ele.name]["count"] = 0;
    }
    sum[ele.name]["sum"] += ele.value;
    sum[ele.name]["count"]++;
}
var result = [];
for (var name in sum) {
    result.push({name: name, value: sum[name]["sum"] / sum[name]["count"]});
}
console.log(result);