How Can I Determine if a Go Struct Property Has Been Initialized?

How Do You Check If a Property Was Set in a Struct?

In Go, if you are not sure if a struct property has been initialized, there are two approaches you can take to determine its status.

Use Nil for Pointer Properties

If your struct properties are pointers, you can check if they are nil to determine whether they've been set. For example:

type MyStruct struct {
    Property *string
}

test := new(MyStruct)
if test.property != nil {
    // Property has been set
}

Compare String Properties to Empty Strings

Alternatively, if your struct properties are strings, you can compare them to empty strings. If the property is equal to an empty string, it has not been set.

type MyStruct struct {
    Property string
}

s1 := MyStruct{
    Property: "hey",
}

s2 := MyStruct{}

if s1.Property != "" {
    // s1.Property has been set
}

if s2.Property == "" {
    // s2.Property has not been set
}

Both of these approaches provide reliable ways to determine whether a struct property has been set in Go.

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