# [JavaScript] Working with Arrays Coding Challenge #3

Rewrite the 'calcAverageHumanAge' function from Challenge #2, but this time
as an arrow function, and using chaining!

Test data:
- Data 1: [5, 2, 4, 1, 15, 8, 3]
- Data 2: [16, 6, 10, 5, 6, 1, 4]

```
//coding challenge #2 
const calcAverageHumanAge = function (ages) {
  const humanAges = ages.map(dogAge =>
    dogAge <= 2 ? 2 * dogAge : 16 + dogAge * 4
  );
  const adults = humanAges.filter(age => age >= 18);
  console.log(humanAges);
  console.log(adults);

  const average = adults.reduce(
    (acc, age, i, arr) => acc + age / arr.length,
    0
  );
  return average;
};

const avg1 = calcAverageHumanAge([5, 2, 4, 1, 15, 8, 3]);
const avg2 = calcAverageHumanAge([16, 6, 10, 5, 6, 1, 4]);

console.log(avg1, avg2);
```

```
// Coding Challenge #3
const calcAverageHumanAge = ages =>
  ages
    .map(dogAge => (dogAge <= 2 ? 2 * dogAge : 16 + dogAge * 4))
    .filter(age => age >= 18)
    .reduce((acc, age, i, arr) => acc + age / arr.length, 0);

const avg1 = calcAverageHumanAge([5, 2, 4, 1, 15, 8, 3]);
const avg2 = calcAverageHumanAge([16, 6, 10, 5, 6, 1, 4]);

console.log(avg1, avg2);
```

![coding challenge 3.PNG](https://cdn.hashnode.com/res/hashnode/image/upload/v1657037375345/pW_ApPRqE.PNG align="left")