use pattern matching in Equals(object) methods

Author: dkackman

src/LinqStatistics/Bin.cs

@@ -104,9 +104,9 @@ public override int GetHashCode()
         /// <returns></returns>
         public override bool Equals(object obj)
         {
-            if (obj is Bin)
+            if (obj is Bin b)
             {
-                this.Equals((Bin)obj);
+                this.Equals(b);
             }
 
             return false;

src/LinqStatistics/ItemCount.cs

@@ -82,9 +82,9 @@ public int Count
         /// <returns>True if obj is a Bin{T} and Value and Count are equal</returns>
         public override bool Equals(object obj)
         {
-            if (obj is ItemCount<T>)
+            if (obj is ItemCount<T> c)
             {
-                return this.Equals((ItemCount<T>)obj);
+                return this.Equals(c);
             }
 
             return false;

src/LinqStatistics/LeastSquares.cs

@@ -117,9 +117,9 @@ public static implicit operator Func<double, double>(LeastSquares ls)
         /// <returns>True if obj is a LeastSquares and has equal m and b values</returns>
         public override bool Equals(object obj)
         {
-            if (obj is LeastSquares)
+            if (obj is LeastSquares ls)
             {
-                return this == (LeastSquares)obj;
+                return this == ls;
             }
 
             return false;

src/LinqStatistics/Range.cs

@@ -123,9 +123,9 @@ internal Range(T min, T max, bool noThrow)
         /// </returns>
         public override bool Equals(object obj)
         {
-            if (obj is Range<T>)
+            if (obj is Range<T> r)
             {
-                return this == (Range<T>)obj;
+                return this == r;
             }
 
             return false;
@@ -155,9 +155,9 @@ public int CompareTo(object obj)
                 return 1;
             }
 
-            if (obj is Range<T>)
+            if (obj is Range<T> r)
             {
-                return this.CompareTo((Range<T>)obj);
+                return this.CompareTo(r);
             }
 
             throw new ArgumentException("Comparand must be of type Range<T>");