How Can We Compare interface{} Values for Equality in Go?

Can We Check for Equality of interface{}?

In Go, it is essential to know how to compare two values for equality, especially when dealing with interface{} types.

Consider the following code snippet:

var v interface{}
for i := 0; i < len(A); i++ {
  if (A[i] == v) {
    fmt.Println("Gotcha!")
    break
  }
}

This code is intended to search for a specific value within a slice of interface{}. However, when dealing with custom structs, the question arises: how do we determine equality for values of those structs that are stored as interface{}?

Thanks to the insights shared in the comments, here's an explanation based on the Go Programming Language Specification:

Interface{} Equality

• Two interface{} values are equal if they have the same dynamic type and value, or if both have a value of nil.
• For a value x of type X and a value t of type interface{}, they are comparable if the values of type X are comparable and X implements T. They are equal if t's dynamic type is X and t's dynamic value equals x.

Struct Equality

• Struct values are comparable if every field in the struct is comparable.
• Two struct values are equal if their corresponding non-blank fields are equal.

In simpler terms, checking for equality in Go is straightforward, regardless of whether you're dealing with interface{} or structs. However, it's worth noting that if you encounter any confusion, the Go playground can be a valuable tool for experimenting and understanding how equality works.

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