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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📢Peercoin Now is Available for Trade on SLEX!🎉
🔗Dear SLEXians, we're excited to inform you that Peercoin is now officially available for trading on the SLEX Centralized Exchange's spot market!
🔹Coin: Peercoin (PPC)
🔹TradingPair: PPC/USDC
🚀Join SLEX Centralized Exchange, deposit and start trading Peercoin on spot market!
#SLEXUpdate#PeercoinTrading#SpotMarket#SLEXTrading#PeercoinOnSLEX
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🎉 Syscoin (SYS) is now available on the SLEX Exchange! 🌟
🚀 Exciting news for all SLEXians: coin of the innovative blockchain platform Syscoin (SYS/USDT) is officially up for trading! This is a special listing because SLEX Exchange supports Syscoin UTXO, Syscoin Rollux, and Syscoin NEVM networks for spot market trading!
🔹Crypto: Syscoin
🔹Trading Pair: SYS/USDT
📈 Dive into trading Syscoin, enhance your portfolio, and boost your earnings with Syscoin (SYS\USDT) on the spot market at SLEX Centralized Exchange.
#SLEXUpdate#SYSUSDTTrading#SpotMarket#SLEXTrading#SYSUSDTOnSLEX
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🎉 Memecoin (MEME) is Listed on SLEX Exchange! 🌟
🚀 Big announcement for the SLEXians: the much-anticipated mem-token, MEME/USDT, is now available for trading on the SLEX Exchange!
🔹Crypto: Memecoin
🔹TradingPair: MEME/USDT
📈 Buy, diversify your portfolio, and trade Memecoin (MEME\USDT) on the spot market on the SLEX Centralized Exchange.
#SLEXUpdate#MEMEUSDTTrading#SpotMarket#SLEXTrading#MEMEUSDTOnSLEX
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📢 Shiba Inu is Now Available for Trading on SLEX! 🌟
🐕 Exciting news for SLEXians: trading pair of famous mem-token, SHIB/USDT, is now live on the SLEX Exchange. This opens up the opportunity for users to trade Shiba Inu in the spot market or leverage it for various long-term investment strategies.
🔹Crypto: Shiba Inu
🔹TradingPair: SHIB/USDT
🚀 Seize the opportunity to successfully trade SHIB/USDT after Elon Mask twits and boost your earnings on the SLEX Centralized Exchange.
#SLEXUpdate#SHIBUSDTTrading#SpotMarket#SLEXTrading#SHIBUSDTOnSLEX
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📢 Chainlink is Now Available for Trading on SLEX! 🌟
🔗 Great news for the SLEX Community! We are excited to inform you that the LINK/USDT trading pair is now available on SLEX Exchange. Users have the opportunity to trade Chainlink on the spot market or use it as part of a variety of long-term investment strategies.
🔹Token: Chainlink
🔹TradingPair: LINK/USDT
🚀Embrace the chance to trade LINK/USDT on the SLEX Centralized Exchange. Deposit now and begin your trading journey with this dynamic pair in the spot market.
#SLEXUpdate#LINKUSDTTrading#SpotMarket#SLEXTrading#LINKUSDTOnSLEX
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📢 Nelore Coin isNow Tradable on SLEX!🎉
🔗Attention SLEX Community, we're excited to share that Nelore Coin has been officially listed and is now open for trading on the SLEX, either for spot market trading or as part of your long-term investment strategy!
🔹Coin: Nelore Coin (NLC)
🔹TradingPair: NLC/USDT
🚀Join the SLEX Centralized Exchange today, make your deposits, and start trading Nelore Coin in the spot market!
#SLEXUpdate#NeloreCoinTrading#SpotMarket#SLEXTrading#NeloreCoinOnSLEX
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📢LanaCoin is Now Available to Trade on SLEX!🎉
🔗Dear SLEXians, we're thrilled to announce that LanaCoin has been officially listed and is now available for spot market trading or long-term strategies investment on the SLEX Centralized Exchange!
🔥
🔹Coin: LanaCoin (LANA)
🔹Trading Pair: LANA/USDT
🚀Join the SLEX Centralized Exchange, deposit, and start your LanaCoin trading on the spot market!
#SLEXUpdate#LanaCoinTrading#SpotMarket#SLEXTrading#LanaCoinOnSLEX
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🎉 Zcash (ZEC) is Now Listed on SLEX Exchange!🌟
🚀 Exciting news for all SLEXians: the highly sought-after cryptocurrency, Zcash (ZEC), is officially available for trading on the SLEX Exchange with two dynamic pairs!
🔹Crypto: Zcash;
🔹TradingPairs: ZEC/USDT & ZEC/BTC;
📈 Engage in trading, enhance your portfolio, and explore the possibilities with Zcash (ZEC\USDT & ZEC\BTC) in the spot market on SLEX Centralized Exchange.
#SLEXUpdate#ZECUSDTTrading#ZECBTCTrading#SpotMarket#SLEXTrading#ZECOnSLEX
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🌐 New Popular Cryptocurrencies Now Live on SLEX Exchange! 🎉
🚀 SLEX has expanded our trading offerings with the addition of Injective (INJ), Arbitrum (ARB), and Gala (GALA)!
🔹 Cryptos Listed:
- Injective (INJ)
- Arbitrum (ARB)
- Gala (GALA)
🔹 Trading Pairs:
- INJ/USDT
- ARB/USDT
- GALA/USDT
🤑Trade these dynamic assets to boost your earnings and diversify your portfolio on the SLEX Centralized Exchange!
#SLEXUpdate#INJUSDT#ARBUSDT#GALAUSDT#SpotMarket#SLEXTrading#TradeOnSLEX
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🌐Exciting New Crypto Listings on SLEX Exchange! 🚀
🎉Big news for traders! SLEX Exchange has broadened our horizons by including a diverse range of new cryptocurrencies in our trading portfolio.
🔹 Newly Listed Cryptos:
- BEAM (Beam)
- FIL (Filecoin)
- SNX (Synthetix)
- DYDX (dYdX)
- FET (Fetch)
- IMX (Immutable X)
- PEPE (PepeCoin)
- AMP (Amp)
- BLUR (Blur)
- SAND (The Sandbox)
💰Dive into trading new promising assets to amplify your earnings and broaden your investment portfolio on the SLEX Centralized Exchange!
#SLEXUpdate#PEPE#BLUR#AMP#SAND#IMX#FET#DYDX#SNX#FIL#BEAM#DiverseTrading#SLEXTrading
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