Choosing Data Structures

Learning Objectives Identify the primary purpose of a data structure. Differentiate between an Array/List and a Dictionary/Map. Analyze a simple problem to determine its data storage needs. Select an appropriate data structure (Array/List or Dictionary/Map) for a given scenario. Justify their choice of data structure based on the problem's requirements, such as order and lookup speed. How does your phone organize your contacts so you can find a friend's number in a split second, but organize your music playlist to play in the exact order you want? 🤔 In this lesson, you'll learn about different ways to organize information in your code, called data structures. We'll focus on how to pick the perfect tool for the job, just like a chef chooses the right knife...

TermDefinitionExample Data StructureA specialized format for organizing, processing, retrieving, and storing data in a computer.A bookshelf is a data structure for books. You can organize them by author, title, or color. Array / ListA data structure that stores a collection of items in a specific, numbered order. You access items using their numerical index (position).A to-do list: `[ '1. Do homework', '2. Walk the dog', '3. Play video games' ]`. The order is important, and each item has a position (0, 1, 2...). Dictionary / MapA data structure that stores a collection of key-value pairs. You use a unique 'key' (like a word in a dictionary) to look up its 'value' (the definition).A user profile: `{ 'username': 'Gamer123&#039...

The Order Rule If the order of items is important, use an Array/List. Use this when you need to store items in a sequence, like steps in a recipe, a playlist, or a history of moves in a game. The position of each item matters. The Lookup Rule If you need to look up items by a unique name or identifier, use a Dictionary/Map. Use this when you need to quickly find a specific piece of information using a label, like finding a student's grade by their ID number or a user's email by their username. The Relationship Rule If data consists of labeled properties of a single object, use a Dictionary/Map. This is perfect for storing related information about one thing, such as a player's stats (health, mana, strength) or a car's properties (color, make, mode...