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36 lines
476 B
Go
36 lines
476 B
Go
package main
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type Stack []interface{}
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func MakeStack() *Stack {
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return &Stack{}
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}
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func (s Stack) Len() int {
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return len(s)
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}
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func (s Stack) IsEmpty() bool {
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return len(s) == 0
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}
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func (s Stack) Top() interface{} {
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if s.IsEmpty() {
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return nil
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}
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return s[len(s)-1]
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}
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func (s *Stack) Push(item interface{}) {
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*s = append(*s, item)
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}
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func (s *Stack) Pop() interface{} {
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if s.IsEmpty() {
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return nil
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}
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ret := (*s)[len(*s)-1]
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*s = (*s)[:len(*s)-1]
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return ret
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}
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