How to calculate sum of object keys in array - javascript

Question

Question

I am working with firebase and react native.

I have returned an array from my firebase database that looks like this.

[Object, Object,         


        

Answer 1

Use Array.prototype.forEach() method to iterate over your array and sum your elements.

Let us suppose your array is var foo = [object, object, object] Each object has this structure, { level : 4 }

Write code like this:

var sum = 0;
foo.forEach(function(obj){
  sum += obj.level;
});

sum will store the sum