Adds assertion to catch going back more than is possible

johnpatrickmorgan · May 23, 2022 · e25db36 · e25db36
1 parent be3c288
commit e25db36
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/FlowStacks.podspec b/FlowStacks.podspec
@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
   s.name             = 'FlowStacks'
-  s.version          = '0.2.0'
+  s.version          = '0.2.1'
   s.summary          = 'Hoist navigation state into a coordinator in SwiftUI.'
 
   s.description      = <<-DESC

diff --git a/Sources/FlowStacks/RoutableCollection+utilities.swift b/Sources/FlowStacks/RoutableCollection+utilities.swift
@@ -62,6 +62,10 @@ public extension RoutableCollection where Element: RouteProtocol {
   /// Goes back a given number of screens off the stack
   /// - Parameter count: The number of screens to go back. Defaults to 1.
   mutating func goBack(_ count: Int = 1) {
+    assert(
+      self.count - count >= 0,
+      "Can't go back\(count == 1 ? "" : " \(count) screens") - the screen count is \(self.count)"
+    )
     guard self.count - count >= 0 else { return }
     removeLast(count)
   }