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-rw-r--r--stack.go7
1 files changed, 5 insertions, 2 deletions
diff --git a/stack.go b/stack.go
index 3c54937..1d5cdb0 100644
--- a/stack.go
+++ b/stack.go
@@ -28,8 +28,11 @@ func (s *Stack) Pop() (v interface{}) {
}
// Peek a top value on Stack
-func (s Stack) Peek() interface{} {
- return s[len(s)-1]
+func (s Stack) Peek() (v interface{}) {
+ if size := len(s); size > 0 {
+ v = s[size-1]
+ }
+ return v
}
// Swap two top values