How Can I Quickly Detect Empty Values in Go Interfaces Using Reflection?

Quick Detection of Empty Values via Reflection in Go

When dealing with interfaces that store int, string, bool, or other values, it's often necessary to determine if the stored value is uninitialized. This means checking if it's equal to any of the following:

• 0 (for int)
• "" (for string)
• false (for bool)
• nil (for pointers and other reference types)

Solution:

To efficiently check this in Go, you can utilize reflection and the reflect.Zero() function:

func IsZeroOfUnderlyingType(x interface{}) bool {
    return x == reflect.Zero(reflect.TypeOf(x)).Interface()
}

Explanation:

• reflect.TypeOf(x) retrieves the type information of the interface value x.
• reflect.Zero(reflect.TypeOf(x)) creates a zero value of that type.
• Interface() converts the zero value back to an interface value.
• Comparing x with the zero value using the == operator checks if the stored value is empty (i.e., uninitialized).

Note:

The original solution used == for comparison, which might not work for types that are not comparable. To ensure universal compatibility, you can use reflect.DeepEqual() instead:

func IsZeroOfUnderlyingType(x interface{}) bool {
    return reflect.DeepEqual(x, reflect.Zero(reflect.TypeOf(x)).Interface())
}

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