Beispiel #1
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 public bool RemoveCoupon(string couponCode)
 => Discount.TryGetCoupon(couponCode, out Discount d) && RemoveCoupon(d);
Beispiel #2
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 public static bool TryGetCoupon(string couponCode, out Discount discount)
 => coupons.TryGetValue(couponCode, out discount);
Beispiel #3
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 public bool AddCoupon(string couponCode)
 => Discount.TryGetCoupon(couponCode, out Discount d) && AddCoupon(d);