How to Determine if a Go Variable is Zero Regardless of its Type?

Determining Variable Zero Value Regardless of Type in Golang

In Golang, not all variables are comparable, such as slices. This presents a challenge in determining if a variable of an arbitrary type is zero. Attempting to use a direct comparison with reflect.Zero(reflect.TypeOf(v)).Interface() fails for non-comparable types.

Go's Solution: reflect.Value.IsZero()

Go version 1.13 introduced the IsZero method in the reflect package. This function allows you to check for zero values even for non-comparable types.

Usage:

To determine if a variable v is zero, regardless of its type, use the following code:

if reflect.ValueOf(v).IsZero() {
    // v is zero, perform custom actions
}

Supported Types:

The IsZero method supports checking for zero values for the following types:

• Basic types
• Chan, Func, Array, Interface, Map, Ptr, Slice, UnsafePointer, and Struct

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