18 lines
294 B
Go
18 lines
294 B
Go
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package main
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// usually: include the discount method in the list.go
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// it is here for clarity
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// TODO: NEW
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func (l list) discount(ratio float64) {
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type discounter interface {
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discount(float64)
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}
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for _, it := range l {
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if it, ok := it.(discounter); ok {
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it.discount(ratio)
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}
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}
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}
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