How Does Go Compare Interface{} Values, Including Structs?

Comparing Interface{} Values

In Go, the equality operators (== and !=) can be used to compare interface{} values. However, since interface{} values can hold values of different types, it's important to understand how these values are compared.

Equality of Interface Values

Interface values are comparable. Two interface values are considered equal if:

• They have identical dynamic types and equal dynamic values, or
• Both have a value of nil.

Equality of Interface Values with Structs

In the case where interface{} values hold custom struct values, Go's comparison rules apply. Struct values are considered comparable if all their fields are comparable. Two struct values are considered equal if their non-blank fields have equal values.

Code Example

Consider the following code snippet:

type MyStruct struct {
    Field1 int
    Field2 string
}

var A = []interface{}{}
v := MyStruct{1, "Test"}

for _, i := range A {
    if i == v {
        fmt.Println("Gotcha!")
        break
    }
}

In this example, the == operator is used to compare an interface{} value (v) with values in a slice of interface{} (A). Since MyStruct values are comparable, the comparison will return true if the corresponding fields in v and the elements in A are equal.

Conclusion

By understanding Go's equality rules for interface{} values and structs, developers can confidently compare these values in their code. Go's clear and flexible system ensures that equality checks work as expected, regardless of the underlying data types.

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