How Can I Return from a Parent Function in Go After a Child Function Executes?

Returning from a Child Function within a Parent Function

One may encounter a situation where they wish to return from a parent function upon calling a child function. In this scenario, the goal is to terminate execution in the parent function apiEndpoint() when a certain condition is met in the child function apiResponse().

The Issue

Using the provided code snippet:

func apiEndpoint() {
    if false {
        apiResponse("error")
        // Return execution in parent function
        // Skip execution of apiResponse("all good")
    }

    apiResponse("all good")
}

func apiResponse(message string) {
    // Returns message to user via JSON
}

The intent is to have apiResponse("error") terminate the execution of apiEndpoint() so that apiResponse("all good") is not executed. However, the default behavior in Go is that a function cannot control execution flow outside of its scope.

Resolution

To achieve the desired outcome, there are several approaches:

1. Use if-Else Statements

If the condition is simple enough, the if-else structure can be used to avoid the explicit return statement:

func apiEndpoint() {
    if someCondition {
        apiResponse("error")
    } else {
        apiResponse("all good")
    }
}

2. Return from Caller Using Values

If both functions return values, you can use a single line of code to return the appropriate value from the caller function:

func apiEndpoint() int {
    if someCondition {
        return apiResponse("error")
    }

    return apiResponse("all good")
}

func apiResponse(message string) int {
    return 1 // Return an int
}

Note

While panicing is another exception that can halt execution, it is not considered a suitable solution in this context and should be reserved for exceptional situations.

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