总结对象中的所有属性

Question

I have the following object:

{"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"}

I want to sum all this values and print It out. How can I sum the properties values? :)

Answer 1

1. Iterate over the object properties using for(var in)
2. Use parseInt since some of the integers are in string form

 var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"}; var sum = 0; for(var key in obj){ sum += parseInt(obj[key]); } document.write(sum);

Answer 2

Here's a way of doing it using ES5's Object.keys and reduce :

 var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"}; var sum = Object.keys(obj).reduce(function(prev, current, index) { return prev + (+obj[current]); }, 0); console.log(sum); // 746

jsFiddle

Answer 3

My for-less version:

 var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"}; function sumProperties(obj) { return Object.getOwnPropertyNames(obj) .map(function(item){ return +obj[item];}) .reduce(function(acc,item) { return acc + item; }); } document.write(sumProperties(obj));

Answer 4

Given

var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional": 299}

you can do it very easily with the lodash library:

var result = _.sum(obj);

If some of your values aren't numbers, you need to map them to numbers first:

var result = _.sum(_.map(obj, function(n){
     return +n;
     //or parseInt(n) or parseInt(n,10)
}));

http://plnkr.co/edit/UQs1aTCJ8qe1kG15G4x7?p=preview

Answer 5

You can do it this way:

var sum_object = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"};
var sum = 0;

for( var index in sum_object ){
    sum += parseInt(sum_object[index]);
    console.log("Val: ",sum_object[index], sum);
};

console.log(sum);

JSFiddle: http://jsfiddle.net/abvuh5m0/

Answer 6

var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"};


function sum(obj){
    var sum = 0;
    for(var key in obj){
      if (obj. hasOwnProperty(key)) {
          sum += parseInt(obj[key]) || 0;  
       }
    }
    return sum
}

console.log(sum(obj));

parseInt(obj[key]) || 0; is important id the value is not a number

Answer 7

Using Lodash:

var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"};

var val = _.sumBy(_.values(obj), function(v) {
   return parseInt(v)
});

Example: https://codepen.io/dieterich/pen/dyymoxM?editors=0012

Answer 8

var sum = 0;
for(var key in objects) {
    sum += parseInt(objects[key]);
}
console.log(sum);