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This article mainly introduces "how to achieve Solidity string splicing". In daily operation, I believe many people have doubts about how to achieve Solidity string splicing. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts of "how to achieve Solidity string splicing". Next, please follow the editor to study!

Try

Let's start with the connectors + and which are common to most languages. To try to modify the code:

/ / pragma keyword: version statement. / / used to instruct the compiler to compile the code to a specific version in order to avoid compatibility problems / / compilers prior to 0.4.0 are not supported here, and compilers after 0.5.0 (condition ^) pragma solidity ^ 0.4.0 suffix contract keyword: contract statement / / similar to class in Java and PHP / / this is to declare a contract named Hello contract Hello {string str= "Hello" / / public: function access attribute (described in more detail in a later article) / / returns (string): define the return value type as string function say (string name) public returns (string) {return str + name;}}

After running the node deploy.js deployment script, an exception was thrown:

TypeError: Operator + not compatible with types string storage ref and string memory

Return str + name

We modified it to. After attempting to deploy, an exception is also thrown:

TypeError: Member "name" not found or not visible after argument-dependent lookup in string storage ref return str. Name

It means that in the smart contract, + and. None of them are connectors. By looking at the official Solidity documentation, we found that the Solidity language does not provide syntax for string concatenators:

At this point, the study of "how to achieve Solidity string concatenation" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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