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DIPAK PAUL@dipakvit#Mapping is a reference type as arrays and structs.Following is the syntax to declare a mapping type.mapping(_KeyType => _ValueType)Try the following code to understand how the mapping type works in #Solidity.#bitcoin#crypto#blockchain#cryptocurrencies#transactionservices .#blockchaintechnology#xinfin#XinFin_Official#technologies#XinFinHybridBlockchain#cryptotrading#ethereum#cryptocurrency#XinPay#Smartcontract