collection expressions

src/Polyfill/InterpolatedStringHandlerArgumentAttribute.cs

@@ -26,7 +26,7 @@ sealed class InterpolatedStringHandlerArgumentAttribute :
     /// </summary>
     /// <param name="argument">The name of the argument that should be passed to the handler.</param>
     /// <remarks><see langword="null"/> may be used as the name of the receiver in an instance method.</remarks>
-    public InterpolatedStringHandlerArgumentAttribute(string argument) => Arguments = new[] { argument };
+    public InterpolatedStringHandlerArgumentAttribute(string argument) => Arguments = [argument];
 
     /// <summary>
     /// Initializes a new instance of the <see cref="InterpolatedStringHandlerArgumentAttribute"/> class.

src/Polyfill/Nullability/NullabilityInfoExtensions.cs

@@ -14,10 +14,10 @@
 #endif
 static partial class PolyfillExtensions
 {
-    static ConcurrentDictionary<ParameterInfo, NullabilityInfo> parameterCache = new();
-    static ConcurrentDictionary<PropertyInfo, NullabilityInfo> propertyCache = new();
-    static ConcurrentDictionary<EventInfo, NullabilityInfo> eventCache = new();
-    static ConcurrentDictionary<FieldInfo, NullabilityInfo> fieldCache = new();
+    static ConcurrentDictionary<ParameterInfo, NullabilityInfo> parameterCache = [];
+    static ConcurrentDictionary<PropertyInfo, NullabilityInfo> propertyCache = [];
+    static ConcurrentDictionary<EventInfo, NullabilityInfo> eventCache = [];
+    static ConcurrentDictionary<FieldInfo, NullabilityInfo> fieldCache = [];
 
     public static NullabilityInfo GetNullabilityInfo(this MemberInfo info)
     {

src/Polyfill/Nullable/MemberNotNullAttribute.cs

@@ -35,7 +35,7 @@ sealed class MemberNotNullAttribute :
     ///   The field or property member that is promised to be not-null.
     /// </param>
     public MemberNotNullAttribute(string member) =>
-        Members = new[] { member };
+        Members = [member];
 
     /// <summary>
     ///   Initializes the attribute with the list of field and property members.

src/Polyfill/Nullable/MemberNotNullWhenAttribute.cs

@@ -46,7 +46,7 @@ sealed class MemberNotNullWhenAttribute :
     public MemberNotNullWhenAttribute(bool returnValue, string member)
     {
         ReturnValue = returnValue;
-        Members = new[] { member };
+        Members = [member];
     }
 
     /// <summary>

src/Polyfill/PolyfillExtensions_String.cs

@@ -108,7 +108,7 @@ public static bool EndsWith(this string target, char value)
     /// <returns>An array that contains at most count substrings from this instance that are delimited by separator.</returns>
     [Link("https://learn.microsoft.com/en-us/dotnet/api/system.string.split#system-string-split(system-char-system-stringsplitoptions)")]
     public static string[] Split(this string target, char separator, StringSplitOptions options = StringSplitOptions.None) =>
-        target.Split(new[] {separator}, options);
+        target.Split([separator], options);
 
     /// <summary>
     /// Splits a string into a maximum number of substrings based on a specified delimiting character and, optionally,
@@ -122,7 +122,7 @@ public static string[] Split(this string target, char separator, StringSplitOpti
     /// <returns>An array that contains at most count substrings from this instance that are delimited by separator.</returns>
     [Link("https://learn.microsoft.com/en-us/dotnet/api/system.string.split#system-string-split(system-char-system-int32-system-stringsplitoptions)")]
     public static string[] Split(this string target, char separator, int count, StringSplitOptions options = StringSplitOptions.None) =>
-        target.Split(new[] {separator}, count, options);
+        target.Split([separator], count, options);
 #endif
 
 #if NETFRAMEWORK || NETSTANDARD2_0 || NETCOREAPP2_0

src/Tests/PolyfillExtensionsTests_CancellationTokenSource.cs

@@ -18,9 +18,12 @@ public static void CancelSource_CancelAsync_NoRegistrations_CallbackCompletesImm
         Assert.True(cancelSource.IsCancellationRequested);
 
         cancelSource = new();
-        cancelSource.Token.Register(() =>
-        {
-        }).Dispose();
+        cancelSource.Token
+            .Register(
+                () =>
+                {
+                })
+            .Dispose();
         Assert.True(IsCompletedSuccessfully(cancelSource.CancelAsync()));
         Assert.True(cancelSource.IsCancellationRequested);
     }