How can I sum some of the values in an object array using reduce (underscore?)

Question

I have the following JSON structure.

var fooArray =
    [{ name: 'firstValue',
     price1: 20,
     price2: 11
    },
    {  name: 'secondValue',
     price1: 54,
     price2: 13
    },
    {  name: 'thirdValue',
     price1: 3,
     price2: 6
    }]

How can I sum up the values in the object array? (other than using a for loop)

{price1: 77,
 price2: 28}

cybersam · Accepted Answer · 2015-08-13 19:36:19Z

2

This is similar to @MatthewMcveigh's answer, but the resulting object does not have a spurious name property:

_.reduce(fooArray, function (accum, x) {
    return { 
        price1: x.price1 + accum.price1, 
        price2: x.price2 + accum.price2
    };
}, {price1: 0, price2: 0});

answered Aug 13, 2015 at 19:36

cybersam

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Matthew Mcveigh · Accepted Answer · 2015-08-13 19:24:59Z

1

You can reduce over the array with a function that sums the properties:

_.reduce(fooArray, function (accum, x) {
    return { 
        price1: x.price1 + accum.price1, 
        price2: x.price2 + accum.price2
    };
});

answered Aug 13, 2015 at 19:24

Matthew Mcveigh

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