How to calculate the average in JavaScript of the given properties in the array of objects

Javascript Web Development Object Oriented Programming

We have an array of objects. Each object contains a few properties and one of these properties is age −

const people = [
   {
      name: 'Anna',
      age: 22
   }, {
      name: 'Tom',
      age: 34
   }, {
      name: 'John',
      age: 12
   }, {
      name: 'Kallis',
      age: 22
   }, {
      name: 'Josh',
      age: 19
   }
]

We have to write a function that takes in such an array and returns the average of all the ages present in the array.

Therefore, let’s write the code for this function −

Example

const people = [
   {
      name: 'Anna',
      age: 22
   }, {
      name: 'Tom',
      age: 34
   }, {
      name: 'John',
      age: 12
   }, {
      name: 'Kallis',
      age: 22
   }, {
      name: 'Josh',
      age: 19
   }
]
const findAverageAge = (arr) => {
   const { length } = arr;
   return arr.reduce((acc, val) => {
      return acc + (val.age/length);
   }, 0);
};
console.log(findAverageAge(people));

Output

The output in the console will be −

21.8

AmitDiwan

Published on 24-Aug-2020 09:40:08

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