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40 lines
556 B
Go
40 lines
556 B
Go
package main
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import "errors"
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type Stack []interface {
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}
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func NewStack() *Stack {
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return &Stack{}
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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) Push(item interface{}) error {
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*s = append(*s, item)
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return nil
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}
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func (s *Stack) Pop() (interface{}, error) {
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if s.IsEmpty() {
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return nil, errors.New("stack is empty")
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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, nil
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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) Len() int {
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return len(s)
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}
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