-
-
Save sergi/4429760 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package main | |
import ( | |
"fmt" | |
) | |
type Stack struct { | |
top *Element | |
size int | |
} | |
type Element struct { | |
value interface{} | |
next *Element | |
} | |
// Return the stack's length | |
func (s *Stack) Len() int { | |
return s.size | |
} | |
// Push a new element onto the stack | |
func (s *Stack) Push(value interface{}) { | |
s.top = &Element{value, s.top} | |
s.size++ | |
} | |
// Remove the top element from the stack and return it's value | |
// If the stack is empty, return nil | |
func (s *Stack) Pop() (value interface{}) { | |
if s.size > 0 { | |
value, s.top = s.top.value, s.top.next | |
s.size-- | |
return | |
} | |
return nil | |
} | |
// Return the value of the element on the top of the stack | |
// but don't remove it. If the stack is empty, return nil | |
func (s *Stack) Peek() (value interface{}) { | |
if s.size > 0 { | |
value = s.top.value | |
return | |
} | |
return nil | |
} | |
func main() { | |
stack := new(Stack) | |
stack.Push("Things") | |
stack.Push("and") | |
stack.Push("Stuff") | |
for stack.Len() > 0 { | |
fmt.Printf("%s ", stack.Pop().(string)) | |
} | |
fmt.Println() | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment