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

You can use Javascript's reduce function. This is basically the same as @epascarello answer but in ES6 syntax.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

const arr = [{level:2},{level:4},{level:5}]; 

const total = arr.reduce((prev,next) => prev + next.level,0);

console.log(total);