From 6d7b57c9f94594fec57e90c06c56fab33438245b Mon Sep 17 00:00:00 2001
From: Timerix <timerix11@gmail.com>
Date: Sun, 11 Jan 2026 02:40:53 +0500
Subject: [PATCH] first time in my life i found a use case for HashSet

---
 Evil Calculator/EquationManager.cs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Evil Calculator/EquationManager.cs b/Evil Calculator/EquationManager.cs
index ead73d9..877d5a7 100644
--- a/Evil Calculator/EquationManager.cs	
+++ b/Evil Calculator/EquationManager.cs	
@@ -2,6 +2,7 @@
 {
     class EquationManager
     {
+        private static readonly HashSet<string> _operators = new() { "+", "-", "*", "/", "^", "√" };
         private ReverseNotationSolver reverseNotationSolver = new();
 
         List<Token> equation = new();
@@ -173,11 +174,11 @@
                 outerOperandLabel.Text = currentOperand == "" ? "0" : currentOperand;
             }
         }
-
+        
         private bool IsOperator()
         {
             if (equation.Count == 0) return false;
-            return new[] { "+", "-", "*", "/", "^", "√" }.Contains(equation.Last().value);
+            return _operators.Contains(equation.Last().value);
         }
 
         private bool IsOpen()