Small fixes

lib/Calculator.Collections/MyStack.cs

@@ -76,7 +76,8 @@ private void GrowIfNeeded()
 
     private void Grow()
     {
-        int newSize = this.capacity * 2;
+        this.capacity *= 2;
+        int newSize = this.capacity;
         Array.Resize(ref this.items, newSize);
     }
 }

samples/Calculator.ConsoleApp/Program.cs

@@ -4,7 +4,7 @@
 
 namespace Calculator.ConsoleApp;
 
-public class Program
+public static class Program
 {
     public static void Main(string[] args)
     {

src/Calculator.Core/Operators/CommaOperator.cs

@@ -23,7 +23,7 @@ public override Token Execute(IReadOnlyList<Token> operands)
         }
         else
         {
-            listOperand = new((Operand)operands[0], (Operand)operands[1]);
+            listOperand = new ListOperand((Operand)operands[0], (Operand)operands[1]);
         }
 
         return listOperand;

src/Calculator.Core/Parsers/FunctionParser.cs

@@ -25,8 +25,6 @@ public bool TryParse(ReadOnlySpan<char> formula, ParsingContext context, [NotNul
         token = null;
         parsedLength = default;
 
-        Token? foundFunction = null;
-
         if (formula.IsEmpty)
         {
             return false;
@@ -36,18 +34,13 @@ public bool TryParse(ReadOnlySpan<char> formula, ParsingContext context, [NotNul
         {
             if (formula.StartsWith(text, StringComparison.Ordinal))
             {
-                foundFunction = function;
+                token = function;
                 parsedLength = text.Length;
-            }
-        }
 
-        if (foundFunction == null)
-        {
-            return false;
+                return true;
+            }
         }
 
-        token = foundFunction;
-
-        return true;
+        return false;
     }
 }

src/Calculator.Core/Tokens/Function.cs

@@ -1,5 +1,4 @@
-using System.Linq;
-using Calculator.Core.Operands;
+using Calculator.Core.Operands;
 
 namespace Calculator.Core.Tokens;
 

src/Calculator.Extra/Enums/OperationPriority.cs

@@ -8,5 +8,4 @@ public enum OperationPriority
     Divide = 2,
     Or = 3,
     And = 4,
-    Unary = 5,
 }

src/Calculator.Extra/Functions/MaxFunction.cs

@@ -16,7 +16,7 @@ protected override Token ExecuteFunction(IReadOnlyList<Operand> operands)
 
         for (int i = 1; i < operands.Count; i++)
         {
-            Operand<decimal> operand = ((Operand<decimal>)operands[i]);
+            Operand<decimal> operand = (Operand<decimal>)operands[i];
             decimal value = operand.Value;
             if (value > result.Value)
             {

src/Calculator.Extra/Functions/MinFunction.cs

@@ -16,7 +16,7 @@ protected override Token ExecuteFunction(IReadOnlyList<Operand> operands)
 
         for (int i = 1; i < operands.Count; i++)
         {
-            Operand<decimal> operand = ((Operand<decimal>)operands[i]);
+            Operand<decimal> operand = (Operand<decimal>)operands[i];
             decimal value = operand.Value;
             if (value < result.Value)
             {

tests/Calculator.Core.Tests/Utilities/IntParser.cs

@@ -25,13 +25,15 @@ public bool TryParse(ReadOnlySpan<char> formula, ParsingContext context, [NotNul
             }
         }
 
-        if (i > 0)
+        if (i == 0)
         {
-            int result = int.Parse(formula[..i]);
-            token = new Operand<int>(result);
-            parsedLength = i;
+            return false;
         }
 
-        return token != null;
+        int result = int.Parse(formula[..i]);
+        token = new Operand<int>(result);
+        parsedLength = i;
+
+        return true;
     }
 }

tests/Calculator.Extra.Tests/CalculatorTest.cs

@@ -45,7 +45,7 @@ public void Calculate_OneVariable_Calculated()
                 "$var1",
                 new Dictionary<string, Operand>
                 {
-                    { "var1", new Operand<decimal>(4.5m) }
+                    { "var1", new Operand<decimal>(4.5m) },
                 }
             )
         );
@@ -54,7 +54,7 @@ public void Calculate_OneVariable_Calculated()
                 "$testVar",
                 new Dictionary<string, Operand>
                 {
-                    { "testVar", new Operand<bool>(true) }
+                    { "testVar", new Operand<bool>(true) },
                 }
             )
         );
@@ -69,7 +69,7 @@ public void Calculate_VariableAndNumber_Calculated()
                 "2.5 * $my_var",
                 new Dictionary<string, Operand>
                 {
-                    { "my_var", new Operand<decimal>(3) }
+                    { "my_var", new Operand<decimal>(3) },
                 }
             )
         );