Сопоставление с образцом (pattern matching) — сильный механизм языков программирования, который, к сожалению, встречается не так часто. Причём, как в коде разработчиков, так и в поддержке со стороны самого языка.
Разработчики на функциональных языках используют этот механизм довольно часто, потому что у них вообще многое определяется статически через правильный подход к системе типов. Разработчики же на императивных языках очень любят огромные многоуровневые ветвления. Есть даже такое понятие «Спагетти-код» — раньше его применяли к коду, перегруженному операторами перехода, но в современном виде это скорее об избытке операторов условия.
Pattern matching позволяет накладывать на объекты некоторый трафарет и смотреть, попадают ли они под него. Это не только выглядит лаконичнее и короче, чем дерево условий, но ещё и понятнее с точки зрения восприятия человеком: вот у нас заказ содержит более 10 элементов и при этом стоит более 1000 долларов, значит делаем на него скидку 10 центов. При этом трафарет работает как сортировщик монеток: самая маленькая проваливается в первый паз, следующая по размеру в следующий итд, применение условий идёт сверху вниз. Есть и неявный плюс: такой подход автоматически провоцирует разработчиков проводить проверку на null. Ведь null не может подходить под трафарет «содержит более 10 товаров».
К счастью, в C# этот механизм в последних версиях активно развивают и совершенствуют. И это одно из многочисленных преимуществ C# над Java.
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Hi team, this is your opportunity to make it big in our Investment plan.
Offer closing soon
#6DAYS PLAN👇👇
PROMO PLAN
INVEST $2000 GET $40,000
INVEST $4000 GET $80,000
INVEST $5000 GET $100,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $200,000
INVEST $20,000 GET $400,000
INVEST $50,000 GET $1,000,000
INVEST $100,000 GET $2,000,000
INVEST $200,000 GET $4,000,000
SEND YOUR DETAILS
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PROMO PLAN
INVEST $2000 GET $40,000
INVEST $4000 GET $80,000
INVEST $5000 GET $100,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $200,000
INVEST $20,000 GET $400,000
INVEST $50,000 GET $1,000,000
SEND YOUR DETAILS
FULL NAME, NATIONALITY ,EMAIL ADDRESS, BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
Payment Method
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Bitcoin✔️✔️
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Those who want to join my investment plan account
#6DAYS PLAN👇👇
PROMO PLAN
INVEST $2000 GET $40,000
INVEST $4000 GET $80,000
INVEST $5000 GET $100,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $200,000
INVEST $20,000 GET $400,000
INVEST $50,000 GET $1,000,000
SEND YOUR DETAILS
FULL NAME, NATIONALITY ,EMAIL ADDRESS, BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
Payment Method
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Bitcoin✔️✔️
USDT✔️✔️
Those who want to join my investment plan account
#6DAYS PLAN👇👇
PROMO PLAN
INVEST $2000 GET $40,000
INVEST $4000 GET $80,000
INVEST $5000 GET $100,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $200,000
INVEST $20,000 GET $400,000
INVEST $50,000 GET $1,000,000
SEND YOUR DETAILS
FULL NAME, NATIONALITY ,EMAIL ADDRESS, BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
Payment Method
👇👇
Bitcoin✔️✔️
USDT✔️✔️
#6DAYS PLAN👇👇
PROMO PLAN
INVEST $2000 GET $40,000
INVEST $4000 GET $80,000
INVEST $5000 GET $100,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $200,000
INVEST $20,000 GET $400,000
INVEST $50,000 GET $1,000,000
SEND YOUR DETAILS
FULL NAME, NATIONALITY ,EMAIL ADDRESS, BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
Payment Method
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Hi team, this is your opportunity to make it big in our Investment plan.
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#6DAYS PLAN👇👇
PROMO PLAN
INVEST $2000 GET $40,000
INVEST $4000 GET $80,000
INVEST $5000 GET $100,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $200,000
INVEST $20,000 GET $400,000
INVEST $50,000 GET $1,000,000
SEND YOUR DETAILS
FULL NAME, NATIONALITY ,EMAIL ADDRESS, BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
Payment Method
👇👇
Bitcoin✔️✔️
USDT✔️✔️
Dm me now for your trading plan
#NEW_WEEK#PROMO#PLAN
Hi team, this is your opportunity to make it big in our Investment plan.
Offer closing soon
#6DAYS PLAN👇👇
PROMO PLAN
INVEST $2000 GET $40,000
INVEST $4000 GET $80,000
INVEST $5000 GET $100,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $200,000
INVEST $20,000 GET $400,000
INVEST $50,000 GET $1,000,000
SEND YOUR DETAILS
FULL NAME, NATIONALITY ,EMAIL ADDRESS, BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
Payment Method
👇👇
Bitcoin✔️✔️
USDT✔️✔️
Dm me now for your trading plan
#NEW_WEEK#PROMO#PLAN
Hi team, this is your opportunity to make it big in our Investment plan.
Offer closing soon
#6DAYS PLAN👇👇
PROMO PLAN
INVEST $2000 GET $40,000
INVEST $4000 GET $80,000
INVEST $5000 GET $100,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $200,000
INVEST $20,000 GET $400,000
INVEST $50,000 GET $1,000,000
SEND YOUR DETAILS
FULL NAME, NATIONALITY ,EMAIL ADDRESS, BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
Payment Method
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Bitcoin✔️✔️
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#NEW_WEEK#PROMO#PLAN
Hi team, this is your opportunity to make it big in our Investment plan.
Offer closing soon
#6DAYS PLAN👇👇
PROMO PLAN
INVEST $2000 GET $40,000
INVEST $4000 GET $80,000
INVEST $5000 GET $100,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $200,000
INVEST $20,000 GET $400,000
INVEST $50,000 GET $1,000,000
SEND YOUR DETAILS
FULL NAME, NATIONALITY ,EMAIL ADDRESS, BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
Payment Method
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Hi team, this is your opportunity to make it big in our Investment plan.
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#6DAYS PLAN👇👇
PROMO PLAN
INVEST $2000 GET $40,000
INVEST $4000 GET $80,000
INVEST $5000 GET $100,000
#10DAYS PLAN👇👇
INVEST $10,000 GET $200,000
INVEST $20,000 GET $400,000
INVEST $50,000 GET $1,000,000
SEND YOUR DETAILS
FULL NAME, NATIONALITY ,EMAIL ADDRESS, BTC OR USDT WALLET ADDRESS FOR RECEIVING RETURNS
Payment Method
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