---
title: Write Higher Order Arrow Functions
---
 Remember to use **`Read-Search-Ask`** if you get stuck. Try to pair program  and write your own code 
### Problem Explanation:
We need to compute and square values from the `realNumberArray` and store them in the variable `squaredIntegers` using the `map()`, `filter()`, and/or `reduce()` functions.
##  Hint: 1
* You will need to `filter()` the `realNumberArray` for positive integers (decimals are not integers).
> _try to solve the problem now_
##  Hint: 2
* You will need to `map()` the values from your `filter()` function to the variable `squaredIntegers`.
> _try to solve the problem now_
##  Hint: 3
* Remember the magic of chaining functions.
> _try to solve the problem now_
## Spoiler Alert!
**Solution ahead!**
##  Basic Code Solution:
```javascript
const squareList = (arr) => {
"use strict";
const squaredIntegers = arr.filter( (num) => num > 0 && num % parseInt(num) === 0 ).map( (num) => Math.pow(num, 2) );
return squaredIntegers;
};
// test your code
const squaredIntegers = squareList(realNumberArray);
console.log(squaredIntegers);
```
 Run Code
# Code Explanation:
Uses the operator `filter()` and `map()` functions to square all positive integers in a given array.
#### Relevant Links
* map()
* filter()
* reduce()
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