Turing Prep Chapter 4: Arrays, Hashes, and Nested Collections

June 2019

Reading time: 6 mins

Article Table of Contents

Array Manipulation Exercises
Advanced Nested Collections

Preparing for Turing Series Index #

What follows is an eight-part series that will help you pick up useful information about a number of topics related to Ruby, specifically geared for students learning the Ruby programming language, as part of the Turing School’s Backend Software Development Program

It’s generally intended that you progress sequentially, but there’s no “right way” or “right order” to encounter these topics. You could convince me I have the order exactly backwards. I’d disagree, but only slightly.

I encourage you to skim around these chapters, get the “shape” of what’s to come, in your mind, and then dive in wherever you want. Good luck, and bug reports are welcome.

So far, we’ve covered some string manipulation and did a few mythical creatures.

You totally don’t have to look through the screencasts in the order I’ve listed below. I just wanted to call out array/hash manipulation on its own page.

You can also look through the whole playlist.

Array Manipulation Exercises #

These are from ruby-exercises/data-types/collections/arrays.rb

I’ll add more screencasts for the other files in this directory soon:

> tree collections
collections
├── README.md
├── advanced_nested_collections
│   ├── nesting.rb               // done
│   └── nesting_test.rb          // done
├── arrays.rb                    // done, what you're reading right now
├── hashes.rb                    // coming soon
└── nested_collections.rb        // coming soon

As I’ve mentioned before, I would recommend you try to stay ahead of me in this video. If you get stuck on making a test pass for more than a few minutes, check that spot of the video, then carry on.

This video is so long because I go into excruciating detail on each test, not just showing the given method that works, but showing how I would google for the right answers if I didn’t know them.

Googling is a skill. Get good at it. :)

Here’s an index of timestamps/what’s covered at that location for this Array manipulation video. #

Advanced Nested Collections #

Inside the collections directory, there’s another directory, advanced_nested_collections; this is well worth your time to play around with.

Here’s a walk-through:

I cover a lot of things in the video; here’s the index:

When you’re done, consider taking a look at some of the more advanced refactoring guides:

Preparing for Turing Series Index #

I encourage you to skim around these chapters, get the “shape” of what’s to come, in your mind, and then dive in wherever you want. Good luck, and bug reports are welcome.