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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 | |
} | |
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() | |
} |
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