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path: root/go/allergies/allergies.go
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package allergies

var index = map[string]int{
	"eggs":         0x01,
	"peanuts":      0x02,
	"shellfish":    0x04,
	"strawberries": 0x08,
	"tomatoes":     0x10,
	"chocolate":    0x20,
	"pollen":       0x40,
	"cats":         0x80,
}

func Allergies(n int) []string {
	if n <= 0 {
		return nil
	}
	var s []string
	for k, v := range index {
		if n&v != 0 {
			s = append(s, k)
		}
	}
	return s
}

func AllergicTo(n int, s string) bool {
	return n > 0 && n&index[s] != 0
}