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-rw-r--r--stack.go18
1 files changed, 18 insertions, 0 deletions
diff --git a/stack.go b/stack.go
index f5260ad..d4cf900 100644
--- a/stack.go
+++ b/stack.go
@@ -22,3 +22,21 @@ func (s *Stack) Pop() (v interface{}, ok bool) {
}
return v, ok
}
+
+// Peek returns top value from Stack
+func (s *Stack) Peek() interface{} {
+ return (*s)[len(*s) - 1]
+}
+
+// Depth returns actual size of Stack
+func (s *Stack) Depth() int {
+ return len(*s)
+}
+
+// Swap swapes to top values
+func (s *Stack) Swap() {
+ size := len(*s)
+ if size >= 2 {
+ (*s)[size-1], (*s)[size-2] = (*s)[size-2], (*s)[size-1]
+ }
+}