MISSION 1 OF 3

Place an interlude

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C# track: IntermediateMission: BeginnerListsInsertionZero-based indexes

Before you start this intermediate track

Typed collections and functions. Later missions use lambdas, LINQ, and nullable values.

Guided code reading and debugging. Runnable coding challenges are available in JavaScript, Python, and SQL.

0 / 6 challenges

KNOWLEDGE CHECK

Predict the result.

Which playback order is printed?

Program.cs

1using System;2using System.Collections.Generic;3var playlist = new List<string> { "Intro", "Waves", "Finale" };4playlist.Insert(1, "Interlude");5Console.WriteLine(string.Join(" / ", playlist));

Use C# 10+ in a .NET 6+ console project. Each example is a complete Program.cs using top-level statements; the shown using directives are sufficient. Run missions separately.

Review the lesson

List stores entries in order and supports insertion at a chosen position. Indexes start at zero, so index one is the second position. Insert moves later entries along instead of replacing them. Joining the list with a separator makes the updated playlist easy to read in one line.

Choose your answer+25 XP on first completion

Intro / Interlude / FinaleIntro / Waves / Finale / InterludeInterlude / Intro / Waves / FinaleIntro / Interlude / Waves / Finale

Read the official language documentation

learn.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1.insert learn.microsoft.com/en-us/dotnet/csharp/linq/standard-query-operators/filtering-data learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/null-coalescing-operator