Recap - Simple Database

Part of the Fundamentals section of Coddy's Lua journey — lesson 89 of 90.

Challenge

Easy

Create a user database system that combines list-style tables, dictionary-style tables, functions, and loops to search for users by their ID.

First, create a list-style table named users containing three user records. Each user should be a dictionary-style table with the following structure:

User 1: id = 101, name = "Alice"
User 2: id = 205, name = "Bob"
User 3: id = 350, name = "Charlie"

Next, create a function named findUser that takes one parameter userId. The function should:

Use a for loop to iterate through the users table
Check if any user's id matches the provided userId
Return the user's name if found
Return nil if no matching user is found

Finally, test your function by calling it three times and printing the results:

Search for user ID 205
Search for user ID 101
Search for user ID 999 (this user doesn't exist)

Try it yourself

-- Create the users table (list-style table containing dictionary-style tables)
-- TODO: Write your code here to create the users table with the three user records

-- Create the findUser function
-- TODO: Write your code here to create the findUser function that searches by userId

-- Test the function and print results
-- TODO: Write your code here to call findUser three times and print the results
-- Remember to search for IDs: 205, 101, and 999