Home Backend Development Golang How to Perform Type Assertion with Function Type Variables in Go?

How to Perform Type Assertion with Function Type Variables in Go?

Nov 02, 2024 pm 06:04 PM

How to Perform Type Assertion with Function Type Variables in Go?

Type Assertion with Function Type Variables

This question seeks to understand how to perform type assertion by passing in a type variable into a function. The goal is to achieve something like the following:

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// Pseudocode

func myfunction(mystring string, mytype Type) {

    ...

 

    someInterface := translate(mystring)

    object, ok := someInterface.(mytype)

 

    ...  // Do other stuff

}

 

func main() {

    // Desired function call

    myfunction("hello world", map[string]string)

}

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Proper Function Declaration for Type Assertion

In order to perform the type assertion in the given function, the proper function declaration should use interface{} for the type parameter. This is because interfaces in Go can hold any type value. Here's a corrected version of the function declaration:

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func myfunction(v interface{}, expectedType interface{}) bool {

    return reflect.TypeOf(v) == reflect.TypeOf(expectedType)

}

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Usage in the Main Function

In the main function, the myfunction can be called by passing in a sample value of the desired type instead of the type itself:

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assertNoMatch := myfunction("hello world", map[string]string{})

 

assertMatch := myfunction("hello world", "stringSample")

 

fmt.Printf("%+v\n", assertNoMatch)  // false

fmt.Printf("%+v\n", assertMatch)  // true

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Approach Explained

The approach uses the reflect package to compare the type of the actual value (v) with a sample value of the expected type (expectedType). This allows us to perform dynamic type checks, just as if we were using a switch statement to check the type of mystring and casting it to the desired type explicitly.

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