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