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Pattern matching – Advanced

Overview

Advanced patterns include relational (<, >), logical (and/or/not), recursive and list patterns.

Introduced In

C# 9–12 (2020–2023)

Example

static string Describe(int[] a) => a switch
{
  [0, .. var rest] when rest.Length > 0 => "Starts with 0",
  [> 10, ..] => "First > 10",
  _ => "Other"
};