C# Fundamentals · Arrays & Methods · Lesson 18 of 22
Lists
Concept
Lists
Unlike arrays, a List<T> can grow and shrink at runtime, with methods like .Add() and .Remove() for managing its elements.
By the end of this lesson
- Explain the core idea behind Lists.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
How to study this page
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
ExampleRunnable
using System.Collections.Generic;
List<string> names = new List<string>();
names.Add("Alex");
Console.WriteLine(names[0]);Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Lists. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Create a List<string> of 3 course names and print the second one.
Loading editor…
Console