[Solidity] How to use the switch statement?

This section explains how to use the switch statement in Solidity.

Conclusion: The switch statement is not supported in Solidity

The current version of Solidity (v0.8.x) does not support the switch statement.

Therefore, you need to use the if-elseif statement instead, or take other alternative measures.

[Solidity] How to write if statements (conditional branching)?

This section explains how to write if statements (conditional branching) in Solidity.SyntaxThere are three patt...

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2023.01.19

Alternative: Use the if-elseif statement

Since the switch statement cannot be used, the if-elseif statement is substituted.

Suppose you want to write the following switch statement in another language (Javascript).

function getColor(selected) {
    switch (selected) {
        case 0:
            return "red";
        case 1:
            return "green";
        case 2:
            return "blue";
        default:
            return "white";
    }   
}

In that case, rewriting the if-elseif statement in Solidity would look like this.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
 
contract Sample {

    function getColor(uint selected) public pure returns (string memory) {
        if (selected == 0) {
            return "red";
        } else if (selected == 1) {
            return "green";
        } else if (selected == 2) {
            return "blue";
        } else {
            return "white";
        }
    }

}

Solidity often does not allow the use of grammars supported by other languages. In such cases, take alternative measures, such as using a different grammar.