Return an average from an array of hash

Question

I am new to working with hashes in javascript and would like to write a function that takes an array of hash and returns the average "grade" for a class.

Here is an example:

Input:

    {"string": "John", "integer": 7},
    {"string": "Margot", "integer": 8},
    {"string": "Jules", "integer": 4},
    {"string": "Marco", "integer": 19}
   

Output: 9.5

Thanks in advance!

Answer 1

let items = [
    {"string": "John", "integer": 7},
    {"string": "Margot", "integer": 8},
    {"string": "Jules", "integer": 4},
    {"string": "Marco", "integer": 19}
]

let avg = items.reduce((a, b) => a + b.integer, 0) / items.length

console.log(avg)