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32 lines
585 B
Go
32 lines
585 B
Go
package main
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// Stack is a limited FIFO for holding sparkline values.
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type Stack struct {
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Values []int
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Len int
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}
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// NewStack inits new Stack with size limit.
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func NewStack(size int) *Stack {
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return &Stack{
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Values: make([]int, size),
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Len: size,
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}
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}
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// Push inserts data to stack, preserving constant length.
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func (s *Stack) Push(val int) {
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s.Values = append(s.Values, val)
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if len(s.Values) > s.Len {
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s.Values = s.Values[1:]
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}
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}
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// Front returns front value.
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func (s *Stack) Front() int {
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if len(s.Values) == 0 {
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return 0
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}
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return s.Values[len(s.Values)-1]
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}
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