Use more effective evaluation order in LanguagePrimitives.IsNullLike() (PowerShell#10781)

vexx32 · iSazonov · commit 25286eb0473c · 2019-10-16T11:38:39.000+05:00
Refactor IsNullLike() to evaluate the most commonly-expected null-like values first.
diff --git a/src/System.Management.Automation/engine/LanguagePrimitives.cs b/src/System.Management.Automation/engine/LanguagePrimitives.cs
@@ -1071,7 +1071,7 @@ internal static bool IsTrue(IList objectArray)
         /// </summary>
         /// <param name="obj">The object to test.</param>
         /// <returns>True if the object is null.</returns>
-        public static bool IsNullLike(object obj) => obj == DBNull.Value || obj == NullString.Value || IsNull(obj);
+        public static bool IsNullLike(object obj) => IsNull(obj) || obj == DBNull.Value || obj == NullString.Value;
 
         /// <summary>
         /// Auxiliary for the cases where we want a new PSObject or null.
