From 849351c8f25597d00c311f0333ec93c4f18d7e91 Mon Sep 17 00:00:00 2001
From: Dominic Go <18517029+dominicstop@users.noreply.github.com>
Date: Mon, 10 Apr 2023 23:19:04 +0800
Subject: [PATCH] =?UTF-8?q?=E2=AD=90=EF=B8=8F=20Impl:=20Add=20`Collection+?=
 =?UTF-8?q?Helpers`?=
MIME-Version: 1.0
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---
 .../Extensions/Collection+Helpers.swift       | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 ios/src_library/Extensions/Collection+Helpers.swift

diff --git a/ios/src_library/Extensions/Collection+Helpers.swift b/ios/src_library/Extensions/Collection+Helpers.swift
new file mode 100644
index 00000000..7502d844
--- /dev/null
+++ b/ios/src_library/Extensions/Collection+Helpers.swift
@@ -0,0 +1,41 @@
+//
+//  Collection+Helpers.swift
+//  react-native-ios-modal
+//
+//  Created by Dominic Go on 4/10/23.
+//
+
+import Foundation
+
+extension Collection {
+  
+  public var secondToLast: Element? {
+    self[safeIndex: self.index(self.indices.endIndex, offsetBy: -2)];
+  };
+
+  public func isOutOfBounds(forIndex index: Index) -> Bool {
+    return index < self.indices.startIndex || index > self.indices.endIndex;
+  };
+  
+  /// Returns the element at the specified index if it is within bounds,
+  /// otherwise nil.
+  public subscript(safeIndex index: Index) -> Element? {
+    return self.isOutOfBounds(forIndex: index) ? nil : self[index];
+  };
+};
+
+extension MutableCollection {
+  subscript(safeIndex index: Index) -> Element? {
+    get {
+      return self.isOutOfBounds(forIndex: index) ? nil : self[index];
+    }
+    
+    set {
+      guard let newValue = newValue,
+            !self.isOutOfBounds(forIndex: index)
+      else { return };
+      
+      self[index] = newValue;
+    }
+  };
+};