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Try / Catch / Finally

Morph provides structured error handling with try, catch, and finally.

Basic Syntax​

try {
    // code that may fail
} catch (errorValue) {
    // handle the error
} finally {
    // always runs (cleanup)
}

Example​

From TryCatch.mx:

module System;

Init method() {
    try {
        throw "try-catch smoke";
    } catch (errorValue) {
        Print(errorValue);
    } finally {
        Print("finally block");
    }
}

Output:

try-catch smoke
finally block

Catching Specific Error Types​

try {
    result is Divide(10, 0);
} catch (DivideByZeroError err) {
    Print("Cannot divide by zero");
} catch (error) {
    Print("Unknown error: " + error);
}

The more specific catch comes first; the general catch acts as a fallback.

Multiple Catch Blocks​

try {
    Process();
} catch (FileNotFoundError err) {
    Print("File not found");
} catch (PermissionError err) {
    Print("Permission denied");
} catch (error) {
    Print("Unexpected error");
} finally {
    Cleanup();
}

finally Is Optional​

try {
    DoWork();
} catch (error) {
    Print(error);
}
// no finally block needed

Next Steps​

  • Throw — Throwing errors