CODEWITHSUNDEEP
javascript
Artdark92
Artdark92

Reputation: 121

Sum complex javascript object properties

I have a complex javascript object. 

var obj = {foo: {bar: {baz1 : {price: 200},baz2: {price: 300}}};

How can I get the sum of price properties in it? Thanks

Upvotes: 0

Views: 219

Answers (5)

codtex
codtex

Reputation: 6558

Here is another function with recursion to do it. For details check the code of getPriceSum() function - the magic is done with reduce method and recursive calls.

var obj = {
  foo: {
    bar: {
      baz1: {
        price: 200
      },
      baz2: {
        price: 300
      }
    }
  }
};

var priceSum = getPriceSum(obj);
console.log('Sum of prices is ' + priceSum);

var obj = {
  foo: {
  price: 100,
    bar: {
      baz1: {
        price: 200
      },
      baz2: {
        price: 300
      },
      baz3: {
        price: 250
      },
    }
  }
};

var priceSum = getPriceSum(obj);
console.log('Another test - prices is ' + priceSum);

function getPriceSum(obj) {
  var sum = Object.keys(obj).reduce(function(sum, prop) {
    if(typeof obj[prop] === 'object'){
      return sum + getPriceSum(obj[prop]);
    }  
    if(prop === 'price'){
      return sum + obj[prop];
    }
  }, 0);
  return sum;
}

Upvotes: 0

Nina Scholz
Nina Scholz

Reputation: 386868

You could use a two step approach by finding all values with the given property name and then aggregate this values.

function getValues(object, key) {
    return Object.keys(object).reduce(function (r, k) {
        if (object[k] && typeof object[k] === 'object') {
            return r.concat(getValues(object[k], key));
        }
        if (k === key) {
            r.push(object[k]);
        }
        return r;
    }, []);
}

var object = { foo: { bar: { baz1: { price: 200 }, baz2: { price: 300 } } } },
    result = getValues(object, 'price').reduce((a, b) => a + b);

console.log(result);

Upvotes: 0

Tree Nguyen
Tree Nguyen

Reputation: 1199

You can try recursive function to look into each of the property.

var sum = 0;
function recursive(obj) {
    $.each(obj, function(key, value) {
        if (typeof value === "object") { //is it an object?
            recursive(value);
        } else {
            sum += parseFloat(value); //if value is string, this will be 0
        }
    }
}

Upvotes: 0

Alexandr
Alexandr

Reputation: 1031

jQuery

var sum = 0

$.each(obj.foo.bar, function(index, value) {
    sum += value.price
}); 

console.log(sum)

Javascript only:

var sum = 0

Object.keys(obj.foo.bar).map(function(objectKey, index) {
    var value = obj.foo.bar[objectKey];
    sum += value.price
});

console.log(sum)

Upvotes: 0

Arun Kumaresh
Arun Kumaresh

Reputation: 6311

try this 

var sum = 0;

for(var i in obj.foo.bar){

sum += obj.foo.bar[i].price;

}

console.log(sum);

Upvotes: 2

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