From 3e7b9ffe3616d0dc3d635fe0e4e80d570cd0f6b0 Mon Sep 17 00:00:00 2001
From: Ming Ming <nkming2@gmail.com>
Date: Mon, 21 Jun 2021 17:04:09 +0800
Subject: [PATCH] Check if number is in specific range

---
 lib/num_extension.dart       | 11 +++++++
 test/num_extension_test.dart | 61 ++++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 lib/num_extension.dart
 create mode 100644 test/num_extension_test.dart

diff --git a/lib/num_extension.dart b/lib/num_extension.dart
new file mode 100644
index 00000000..cb0cbc54
--- /dev/null
+++ b/lib/num_extension.dart
@@ -0,0 +1,11 @@
+extension NumExtension on num {
+  bool inRange(
+    num beg,
+    num end, {
+    bool isBegInclusive = true,
+    bool isEndInclusive = true,
+  }) {
+    return (this > beg || (isBegInclusive && this == beg)) &&
+        (this < end || (isEndInclusive && this == end));
+  }
+}
diff --git a/test/num_extension_test.dart b/test/num_extension_test.dart
new file mode 100644
index 00000000..59b4e8cb
--- /dev/null
+++ b/test/num_extension_test.dart
@@ -0,0 +1,61 @@
+import 'package:nc_photos/num_extension.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group("NumExtension", () {
+    group("inRange", () {
+      test("[x, y)", () {
+        expect(10.inRange(0, 20, isBegInclusive: true, isEndInclusive: false),
+            true);
+        expect(0.inRange(0, 20, isBegInclusive: true, isEndInclusive: false),
+            true);
+        expect((-1).inRange(0, 20, isBegInclusive: true, isEndInclusive: false),
+            false);
+        expect(20.inRange(0, 20, isBegInclusive: true, isEndInclusive: false),
+            false);
+        expect(21.inRange(0, 20, isBegInclusive: true, isEndInclusive: false),
+            false);
+      });
+
+      test("[x, y]", () {
+        expect(10.inRange(0, 20, isBegInclusive: true, isEndInclusive: true),
+            true);
+        expect(
+            0.inRange(0, 20, isBegInclusive: true, isEndInclusive: true), true);
+        expect((-1).inRange(0, 20, isBegInclusive: true, isEndInclusive: true),
+            false);
+        expect(20.inRange(0, 20, isBegInclusive: true, isEndInclusive: true),
+            true);
+        expect(21.inRange(0, 20, isBegInclusive: true, isEndInclusive: true),
+            false);
+      });
+
+      test("(x, y)", () {
+        expect(10.inRange(0, 20, isBegInclusive: false, isEndInclusive: false),
+            true);
+        expect(0.inRange(0, 20, isBegInclusive: false, isEndInclusive: false),
+            false);
+        expect(
+            (-1).inRange(0, 20, isBegInclusive: false, isEndInclusive: false),
+            false);
+        expect(20.inRange(0, 20, isBegInclusive: false, isEndInclusive: false),
+            false);
+        expect(21.inRange(0, 20, isBegInclusive: false, isEndInclusive: false),
+            false);
+      });
+
+      test("(x, y]", () {
+        expect(10.inRange(0, 20, isBegInclusive: false, isEndInclusive: true),
+            true);
+        expect(0.inRange(0, 20, isBegInclusive: false, isEndInclusive: true),
+            false);
+        expect((-1).inRange(0, 20, isBegInclusive: false, isEndInclusive: true),
+            false);
+        expect(20.inRange(0, 20, isBegInclusive: false, isEndInclusive: true),
+            true);
+        expect(21.inRange(0, 20, isBegInclusive: false, isEndInclusive: true),
+            false);
+      });
+    });
+  });
+}