Welcome to our practice-focused lesson on Basic Array Operations. An array in Ruby is an ordered collection of elements that can be of any type, from numbers and strings to custom objects.

Working with arrays is a fundamental aspect of Ruby programming. While Ruby offers numerous built-in methods that make working with arrays straightforward, learning to perform these operations manually sharpens your problem-solving skills. It also deepens your understanding of how data structures work under the hood and prepares you for programming environments that may not provide such high-level abstractions.

Let’s start with a simple task: finding the maximum element in an array. Without Ruby’s built-in max method, we need to manually traverse the array, comparing each element to a variable initialized with the first element.

As we go through each element, if we find one that’s greater than our variable, we update the variable. By the end of our traversal, this variable holds the maximum value in the array.

Here’s how it looks:

Ruby
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1def find_max_element(arr)
2  return nil if arr.empty?  # Handle the edge case where the array is empty
3
4  max_element = arr[0]  # Start with the first element
5  arr.each do |element|
6    max_element = element if element > max_element
7  end
8  max_element
9end
10
11# Example usage
12sample_array = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]
13puts find_max_element(sample_array)  # Output: 9

This code demonstrates how to manually find the maximum value in an array by comparing each element one by one. Note that we first check if the array is empty. If it is, we return nil, as there is no maximum value in an empty array.

Grasping this concept fully is essential, as it lays the foundation for many more complex algorithms. In the practice section, you’ll tackle tasks that require this and other fundamental array manipulation operations. Our goal isn’t just to teach specific algorithms but also to help you understand how simple, well-organized code can solve more complex problems.

Let’s jump into some hands-on coding exercises and build on this foundation!