adding values of an array stores as a property of an object

Question

I have an array which looks like this

var x = [
    {
        "name" : "Paris",
        "count" : [1,30, 20]
    },{
        "name" : "London",
        "count" : [5,30, 10]
    }
]

I am trying to resolve into something this by adding the numbers of the property "count"

var y = [
    {
        "name" : "Paris",
        "count" : 51
    },{
        "name" : "London",
        "count" : 45
    }
]

Here is my code

var y = []
function doTotal(x, i){
    var out = 0;
    for(var j = 0; j < x[i].count.length; j++){
        out += x[i].count[j];
    }
}
for(var i = 0; i < x.length; i++){
    y[i] = {
        name : x[i].name,
        total : doTotal(x, i)
    }
}

console.log(y)

..total is undefined. What am I doing wrong?

yes..thats all it was...i pulled my hair out for an hour with this — soum
– soum, Commented Jun 10, 2015 at 23:00

bugwheels94 · Accepted Answer · 2015-06-10 22:57:52Z

2

You need to return variable out inside dototal function

var x = [
    {
        "name" : "Paris",
        "count" : [1,30, 20]
    },{
        "name" : "London",
        "count" : [5,30, 10]
    }
]
var y = [
    {
        "name" : "Paris",
        "count" : 51
    },{
        "name" : "London",
        "count" : 45
    }
]
function doTotal(x, i){
    var out = 0;
    for(var j = 0; j < x[i].count.length; j++){
        out += x[i].count[j];
    }
    return out;
}
for(var i = 0; i < x.length; i++){
    y[i] = {
        name : x[i].name,
        total : doTotal(x, i)
    }
}
alert(JSON.stringify(y));

answered Jun 10, 2015 at 22:57

bugwheels94

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