Build the Largest Number Finder

In this lab, you will build a function that returns an array consisting of the largest number from each provided sub-array. Remember, you can iterate through an array with a simple `for` loop, and access each member with array syntax `arr[i]`. **Objective:** Fulfill the user stories below and get all the tests to pass to complete the lab. **User Stories:** 1. You should create a function `largestOfAll` that takes an array of arrays as an argument. 2. The function should return an array containing the largest number from each sub-array.