通过for循环访问数组Object属性值

Question

I want access the object property which in inside array how to access that through a for loop ex:

arr[{A:1},{A:2},{B:3},{C:3}] 

i want sum of each object.

Answer 1

If you have same known key in object, then you can try this

var data = [{a:6},{a:8},{a:9}];
var dataLength = data.length;
var total = 0;
var i = 0;

while(i < dataLength){
total += data[i]["a"];
i++;
}

If you have object with unkown keys / dynamic keys, then use this,

var data = [{a:6},{b:8},{c:9,e:5}];
var dataLength = data.length;
var total = 0;
var i = 0;

while(i < dataLength){

for(var propName in data) {
    if(data.hasOwnProperty(propName)) {
        var propValue = data[propName];
        total += propValue;
    }
}

i++;
}

Answer 2

 let arr = [{A:1},{A:2},{B:3},{C:3}] let sum = arr.reduce((ac, o) => ac + Object.values(o)[0], 0); console.log(sum);